I also acknowledge that I’m coming from the furry community, who are particularly passionate about remix culture compared to other avatar creation communities on VRC.
A lot of communities are like this. It was the core behavior, even before furries. Back when all that was available was MMD and TDA avatars, it was all about remixing those TDA avatars. But you are right, this is exactly one of those things that needs to be preserved.
To add to this, it might open for expansion of the store, allowing original creators to sell an avatar, and upload their remix (including fashion sellers) with a prerequisite to purchase the original.