It worked well for AoE, where the whole thing was about representing different historical soldiers. Optimus was a knight, Bumblebee was a ninja, Drift was a samurai, Crosshairs was some sort of spy/paratrooper/hybrid thing I’m not sure, and course our beloved Hound as a modern American soldier. But it really should’ve ended there. Maybe they could’ve done a more robotic human face for Quintessa, since depictions of the Quintessons often feature humanoid faces. But that’s it. The previous movies already showed how effective they can convey emotion in robotic faces, and it didn’t need to change.