We're talking about transitions where the library authors deliberately want to (and have good reasons) to migrate whole organization over. It's not they who are pretentious in your scenario ;)
I think that really depends. If there are performance, compliance, or maintenance requirements for the new versions where this is being implemented, and devs are updating to, then it could be considered reasonable. You wouldn't be seeing these delays if you continue using old versions of the library. Freeze your dependencies if you don't want your dependencies to change.