This would also be easy to do if an API is designed around versioning from the beginning, because often it isn’t and it requires a lot of boilerplate and duplic

This would also be easy to do if an API is designed around versioning from the beginning, because often it isn’t and it requires a lot of boilerplate and duplication, and it just results in everything being slapped into v1. Especially the case in frameworks that prescribe a format for routing.