For FCP users (and other non-Adobe users). My guess is raising subscription prices for non-Adobe users, focus on Adobe integration over others, and possibly dropping support of non-Adobe products at some future point.
Michael – There are plenty of users who never use the integration. Frame is far more versatile when you don’t use the various NLE integrations, IMHO. So you can (and always have been able to) use Frame by itself, even if you never touched an NLE.