It does feel like the author has somewhat missed the fact that Twitter has become a space in which, while you can technically say whatever you want, is driven overwhelmingly by opinions on topic-du-jour social issues.

Further, the communities on Twitter that aren't part of this are largely segregated from the hive by virtue of consisting of users that are explicitly trying to avoid it. And there's a perpetual risk that the forerunners of those communites are eventually sucked in by the Borg Cube of banal political debate regardless - we've all seen this happen in our feeds, and there's a good chance you've unfollowed or muted at least one person for abruptly and loudly picking up on some political or social topic.

This is pretty much exactly what Mastodon is trying to avoid. Having over-subscribed political debate forums hang a sign over their door is definitely fine by me.