I don't think so. I prefer the aesthetics of the DX models, but the fact that they are on the blocky, segmented rig as the DC original causes some problems with them, and it also brings up lots of inconsistencies throughout for 2D elements that still show the DC models, as well as making them clash with the NPCs. I switch back and forth depending on my mood, but sticking with the originals is a valid choice. Especially when we get to SA2B where Sonic has rounded ears, a larger stomach and the actual model is apparently less functional, and therefore barely used in any cutscenes (and shows less motion in the ones it is used in, such as the one where Sonic meets Shadow and his ear no longer twitches when he detect's Shadow's presence.) So there are valid reasons to revert to the DC models in the Adventure games. I know you said nothing of SA2, but I find it relevant to the discussion of "why downgrade the assets of the upgraded port", when there are times where it's very valid.