I don't think so, there's a lot of development in AOSP as well, Hangouts and Play Services are only getting major visibility because they can be deployed to all versions of Android without waiting for the manufacturers.
On the other end, I think that forks with breaking changes could lead to fragmentation, where some stuff works in a fork and doesn't in the other. Isn't that the definition of breaking change?
On the other end, I think that forks with breaking changes could lead to fragmentation, where some stuff works in a fork and doesn't in the other. Isn't that the definition of breaking change?