One problem is that your average designer will not know what versioning is, never mind have an opinion as to whether it'd be useful or not.
I see this as a case of applying a successful model from one field to another without consideration around whether this is actually a problem in the first place.
The usefulness of versioning and other successful models in other fields/contexts is an interesting thing to think about. It could be that some applications of these models are not solving existing problems so much as creating new opportunities. Versioning for art and design could create new opportunities for collaborative creation even if it doesn't solve the problems of existing artists and designers. I don't know how well this can work, though.
I see this as a case of applying a successful model from one field to another without consideration around whether this is actually a problem in the first place.