This goes back to not voting in every election. Groups that invest (money, time, votes) on local races (city council, school board) have a greater variety to pick when one of these people goes on to higher office (state-level, county-level) and then goes on to federal office.
The primaries are already too late - it's all about the local races.
Mastodon communities currently defederate from instances of over a certain size (including .social) because of how hard it is to moderate large instances, beehaw isn't doing anything weird in this case.