Counterpoint: If the fediverse has any hope of achieving critical mass, it can’t confuse users by constantly breaking federation for every minor disagreement.
Constantly, it's great. There's big air-gaps between the US Lefty and US Righty fediverses. If you want to talk to both sides of that divide then you'll want to have accounts on multiple servers. If you decide to only be on one side then it's easy to migrate your accounts around between servers.