The so called super units like Legion, Centurion and Cataphract all have the same unit model than their previous upgrades. Being attacked by a bunch of Centurions can be quite a different thing that being attacked by Phalanxes and I think the difference should be visible in the unit models to make it easier to see what you are dealing with. Are these super units going to get different unit models than their earlier upgrades?
This idea always intrigued me when i was younger. AOE 2 has this feature in it’s unit models and i always found it cleaner for competitive multiplayer to see, at a glance, what army comp your opponent had so you could react faster to counter as best within your means. It is a quality of life idea that i would approve of in the Re-mastery.