I mean you could argue that they are returning to the way the original Transformer toys worked. Here is an example of the OG Optimus toy. I went to Hasbro's website to see what the most current version of Optimus is that they are selling and I found this. That actually looks surprisingly similar, though I would argue they have gone more of the direction of making the robot look more robotic and the truck a little less truck like but its still a solid middle ground.
Alternators Optimus Prime transforms into an accurate, fully-licensed 1:24th scale Dodge Ram SRT-10. The vehicle mode features rubber tires, functional steering, opening hood, tail gate and doors with a detailed cabin interior. His robot mode body sculpt details are based upon the 20th Anniversary Optimus Prime toy. However, his headsculpt is based upon Powermaster Optimus Prime. He is armed with a small pistol that is formed from his engine.
The second known version  ditched the triplechanging gimmick on the cab and simplified things a good bit. This Powermaster Prime has several distinct characteristics only seen in the second design, such as the wider "block head" and two faux smokestacks on top of either shoulder as opposed to one. Also, in a rather odd twist, this design features a black head and fists for both super and regular modes rather than the traditional blue. It also had yellow eyes in either mode a la the original Optimus Prime.
Released as part of the Bumblebee Energon Igniter's Speed Series line, this Optimus is a Legends/Legion-sized mold that transforms from robot into a Cab-over truck with the transformation scheme shared with the Transformers (2010) Reveal The Shield Legends Class toy, and he features 3mm compatible hands. Optimus' truck mode can also be attached with the Energon Igniters core, and due to the toy being lightweight, it can propel his vehicle mode forward very quickly, making him a fast-moving truck. Due to its simplified transformation, Optimus' robot shoulder parts ended up sticking out from his truck mode, and his upper cabin panel ends up being integrated with his head. Unlike most Speed Series toys, his Energon Igniter port is ends up under his right foot in robot mode rather than on his knee.
(As an odd postscript to this tale of footwear-induced madness, although the promo pictures all showed the shoeformer as a white and navy blue sneaker that transforms into a white and aqua blue robot, the product actually released sported much darker colors for all the robot-mode parts, with a deep teal instead of aqua, and almost all the white replaced by an icky tan/cream/grey color, including the head. Basically, the figure looks like the promo picture viewed through really dark sunglasses. Although this certainly doesn't make it look any more like Prime, you might argue that it looks a little less like Magnus. Sorta. Maybe. Not really.)
When Sideswipe was accused and convicted of destroying the Nova Suspension Bridge, Optimus was infuriated that one of his own Autobots could commit such a heinous act. Optimus was tasked to hunt down and deactivate Sideswipe, though the task proved to be easy as Sideswipe did not run, hide or resist. After Optimus had deactivated Sideswipe, he was approached by Prowl, who pointed out that Sideswipe's actions made little sense, as he had committed the crime in broad daylight before many witnesses. Agreeing that the Decepticons might be behind the situation, Optimus allowed Prowl to take a team of Autobots to Carob Island to clear Sideswipe's name while Optimus and Jazz stayed behind to continue working on human/Autobot relations. Prowl returned with evidence that it was indeed a Decepticon-controlled clone of Sideswipe that had committed the crime. Optimus then presumably reactivated Sideswipe when his name was cleared. Deadly Paradise
The back story of the Transformers on ancient Cybertron is told in Transformers: Defiance. In this story, Starscream returns to Cybertron after encountering an enemy scout ship in the Eshems Nebula. After being repaired for minor damage by Ratchet, Starscream and Ironhide report to Optimus Prime and Megatron. In issue #2, Optimus Prime is ordered by Megatron to counter-attack Cybertron's invaders, but instead, Optimus organizes a resistance to Megatron's decision. In issue #3, Optimus Prime, Jazz, and Prowl break into Megatron's quarters while he is away looking for clues to why he is acting so strangely. What they find is an ancient artifact that Megatron had restored.
In the alternate universe of the 2003–2004 toyline and series, Transformers: Energon, Rodimus (lacking the "Prime" suffix in English, but still called Rodimus Convoy in Japan) was a great leader on Cybertron ages in the past and was viewed as a hero by many, including similar character Hot Shot. Desiring to escape the war that had consumed the planet, Rodimus departed Cybertron with a contingent of like-minded troops, most of whom settled on an alien planetoid and became the energon-mining Omnicons. Still, Rodimus continued on his journey with Prowl and Landmine, carrying the "flag of peace" from world to world.
The Reveal the Shield Legends Prime mold was redecoed again for the inclusion in the second EZ Collection wave. This version of the figure replaces his blue on the head with black, and the blue paint on the legs is stripped off, revealing the black plastic underneath. and like the Megatron redeco in the same wave, features a Generation 2 Autobot symbol instead of a Generation 1 insignia.
This mold was redecoed by Takara in 2000 as Car Robots Black Convoy. The following year, it was released by Hasbro as Black Convoy's 2001 Robots in Disguise franchise counterpart, Scourge, with retooled discs that lacked the Autobot insignia. Following this, the next use of the mold was planned to be Universe Toxitron, which ended up being canceled. The modified tooling was also used when Laser Prime was reissued by Takara in 2006 with a modified deco (see below), and for the e-Hobby exclusive Laser Ultra Magnus that accompanied the reissue's release. In 2015, Platinum Edition Year of the Goat Optimus Prime, another repaint version, comes with partially transparent plastic torso.
Menasor cut off Prime's escape and handed him the Reflector trio, who confronted Prime with a hologram of Serpent O.R. The new Decepticon leader carried Megatron's memories and information downloaded from Soundwave, from which he learned of the Matrix of Leadership. Serpent O.R. offered Optimus a trade: hostages and peace if he handed over the Matrix. Optimus agreed.
Prime was brought back to the Autobot base for treatment, but the Decepticons exploited the Autobots' lack of manpower and struck again before Prime recovered. With his men taking a pummeling, the unconscious Prime had a vision of Akira, who spurred him on to awaken and rejoin the battle. With another power boost from Wataru, Prime unleashed a super-charged shot from his ion blaster that took down the fleeing Decepticons. Time of Resurrection
Just which character this toy represents is up for debate. The toy's bio claims he used to turn into a tractor-trailer (indicating Optimus Prime), but considering the timeframe of when they were written and the whole lack of a stance on who Primal "was" before the show and blah blah blah... it's just easier to file this under the same iffiness as the original toy bios set on modern Earth and leave it at that.
After having spent an extended period of time lost on Quintessa, Optimus was returned to Cybertron by the Turbomasters during their efforts to retrieve the similarly lost Flash, who he had been drawn into Perceptor's Dimensional Interface Assembly. The Age of Wrath Pt.5 Though badly damaged, Optimus led an insurrection against the then Megatron-controlled Cybertron, and successfully overthrew his enemy from power, all the while thwarting a Quintesson invasion. The Age of Wrath Pt.6
An extremely simplified version of Optimus Prime, this McDonald's Happy Meal toy transforms into a trailer-less truck cab. He is formed out of a large percentage of translucent plastic, and can combine with the other Happy Meal Armada toys (Hot Shot, Red Alert, and Smokescreen) into a human (well, robot) pyramid-style configuration, notionally considered a "Mighty Robot".
When the Ark's sensors picked up two Transformer power emissions in the Brazilian rain forest of non-Decepticon origin, Optimus headed into the field to investigate, bringing along Jazz and Blaze. Though their search went poorly at first, the surrounding vegetation interfering with their energy trackers, one of the mystery Transformers soon found them! The source of the readings turned out to be two terrifying robot dinosaurs! As Optimus charged one of them, Megatron and his troops turned up, and blasted the Autobot leader unconscious. He awoke to find the Decepticons fleeing in defeat, and the creatures transformed into their Autobot forms. Grimlock introduced himself and Snarl, but told Optimus that they wouldn't be following the Autobots back to home-base, as they had two more companions to unearth first. Optimus bid him farewell with a handshake before leaving to carry on the war against Megatron. The Dinobots!
The Transformers Energon figure pen is based on Optimus Prime in his standard Energon body. About the size of a scout class toy, he transforms from truck mode to robot mode almost identically to his mainline toys, apart from the fact that his feet contain the pen and cannot bend. It's really hard to write with, and almost impossible to pose, even though it has full arm articulation. Amusingly, this figure can position itself to transform into his super robot mode (by flipping his helmet on, opening his chest and flipping his hands in), but because there are no versions of the Prime Force drones in this scale, it's impossible to complete him.
Part of 9th wave of One-Step Changers, and the first of the Combiner Force subline, this Optimus Prime is yet another new mold, with a different transformation scheme (a similar engineering to Age of Extinction's Bumblebee) consisting of pulling the switch on the back (do not hold the truck kibble when you transform him). Like most One-Step Changers, Optimus Prime features limited articulation on the shoulders, and features 5mm compatible hands.
The earliest releases of Energon Optimus Prime have no ridges on the inside of the chest windows and a different head sculpt featuring an Optimus Primal-style mouth-slit in Prime's mouthplate. This was soon replaced with a full mouthplate, and it was this version of the toy which appeared in the Energon cartoon and was released by Takara. Other changes made to Takara's version of the toy involved a chromed front grill, more vibrant plastic colors on Digger-3 and Submarine-4, a darker blue plastic on Prime himself, and more intricate paint operations. Takara's release lacks the electronic sound effects seen in Hasbro's version, which were commonly gutted for the Japanese releases of any Autobot toys who had them, though Prime retains his light-up chest.
After the rise of the Decepticons and the death of the merciless Zeta Prime, he became the Prime, and entered what would become a millions-of-years-long war of attrition with the Decepticons, which would lead to the death of Cybertron and the spreading of the Cybertronian civil war far beyond their homeworld in a push for resources. With the end of the war and the emptying of the Matrix of Leadership to restart Vector Sigma and rebirth Cybertron, he found himself rejected by the returning civilian population, and - secretly gladly - abdicated his rank and returned to his original name of Orion Pax as he travelled through the galaxy.
Prime's trailer opens up into his Combat Deck, containing the scout drone, Roller. The interior of the Combat Deck features three pegs that can accommodate Prime's laser rifle, fuel pump and nozzle accessories, and seating for two Diaclone drivers. As its central feature, the Combat Deck features a missile-armed repair drone pod mounted upon a boom lift arm (featuring another cockpit for a Diaclone driver), which can also be extended through holes in the trailer's roof and front-end when it is closed. Situated in the base of the boom arm is a spring-loaded launcher that can launch Roller out of the Combat Deck and into action. Roller himself has seating for four Diaclone passengers, and features a port that can accommodate either Prime's rifle or the fuel pump. The interior space of the trailer allows storage room for one standard Autobot car, which can also be shot forward by the launcher.