ok, that's probably not the popular opinion, but a reasonable argument.

i think though that the chrome manifestV2 support example is not really applicable to your argument though. chrome still exists, and the removal of a feature is not the same thing as stopping to release sources altogether. if google had stopped releasing chrome sources then some chrome forks with v2 support would still exist. same i believe would be true if google stopped android releases.

same goes for security patches. a lot of effort in forks now is put in keeping up with android (and chrome) releases. if those releases stop then the effort would be able to shift towards security patches. would it be better or worse? hard to say. depends on the resources the forks would manage to gather to do the work.