They also reuse models for enemies and only some bosses have unique models. I think the 3 new trials do but I could be wrong. But I do recognize the models instantly for overworld enemies or quest enemies like the healer role quest level 90 had a level 90 titan model. I get that the models are different enough and game development is hard and this is probably the smartest route to take but it has never been any different in any expansion. Now that we are at the end... it won't change and neither will the reuse of gear sets.