You'd end up with having to go to a different community regardless. It would just mean using a new community name rather than the server+community federated name.

Currently if something like /c/technology goes rogue, you'd end up either joining c/technology@beehaw.org or someone creates /c/tech.. or both. In tighter federation, /c/technology is toast so you move to /c/tech or something like that instead but there's no option for a /c/technology@some-other-server. In some ways more limiting but it ends up easier for the end user.