>>8404488Basically it's a design trope that got popular in Beast Wars era and beyond, where the alternate mode was just a "shell" that hid the robot parts inside. It's a divisive way of doing things as many feel you're not "transforming" the toy so much as taking huge chunks of one mode and setting it aside while the other mode is already there.
Hasbro's Unicron is one because they chose to structure it that the planet features are almost entirely regulated to the back side of the figure, with very little actually contributing to the overall form of the robot mode. While Cell's way of doing things is more "honest", it also comes with its own caveats think are flaws in its own way-- the planet mode has to concede its colors and design quite a bit to allow the robot mode to work, and extra parts are even included to "fix" that, but either require removal or then altering the robot mode look.
I think in the end we're better off that both toys can exist, as they both set out to achieve the same goal using two very different design philosophies and thus wind up offering two very different figures for fans to potentially enjoy.
