There are certain accessories (such as auras) that in my opinion look good on the character on site in a frozen position but in game seem off based on how they move with the character and that they statically persist. I am also wary of wearing weapons in games since some games visually weld their own weapons to characters.
So as a Roblox player, it is currently too hard to make an avatar that looks epic on site and in game. Additionally I feel that some very nice avatars on site lose their magic as you play with them (ie playing with an avatar humanizes it).
If Roblox is able to address this issue, it would improve my experience because I could make avatars that I am satisfied with.
Edit: I think there is an analogy to how in real life you don’t update your socials profile pictures with how you look each second.