If Alice makes a followers-only post, and Bob replies to it, to whom should Bob's reply be visible?
@evan Only Alice's followers. Those of Bob's followers who are not Alice's followers cannot see the context Bob is replying to. Reading answers without any context introduces a lot of noise in the channel (ambiguity specifically). Ambiguity also has the tendency to trigger a lot of anxious questions in people who read them (and sometimes then reply to ask for the context). For me, these kind of interactions lowers the quality of my network.