Personally? I like the asymmetric style of the current game, it adds character and gives a strong aesthetic to each team. Having the rebellion using older (and technologically inferior) vehicles to the occupying empire makes some sense, as they might be salvaging and repurposing older retired vehicles to fill their army. This is an interesting quote from the TF2 developer commentary on model design and readability. https://wiki.teamfortress.com/wiki/Well_developer_commentary (see points 13 and 15) I do know there is an imbalance between NF and BE tanks in Empires, and this is less than ideal. However the unique silhouettes and shapes of the vehicles makes them immediately identifiable at any distance. You can tell the class of tank, and which team it belongs to from just the outline alone. I fear if the tanks become too similar, you won't be able to tell them apart from a distance, especially with envionmentally appropriate camo.