But the biggest thing they could have done is focus on other specific artist renditions. Instead of generic Optimus Prime, Geoff Senior's PM Optimus Prime. Instead of generic Prowl, Andrew Wildman's Prowl. Alex Milne's Rodimus, EJ Su's Starscream, Sarah Stone's Windblade, and so on.
That just feels to me like it would be so much more interesting. (Apart from being the only feasible way to get proper pretender shell updates)
Oh gods, I would love to see all of those so much - especially IDW-comic-accurate renditions of some characters. Can you imagine a whole line based on Su's designs? Man, that'd be... like over a decade too late, but still awesome.
The Bumblebee movie Bumblebee is kind of the closest we've gotten to that... but still not close enough. And given that none of the toys really match the screen design anyway, yeah, we're still waiting.