Distributing power across a group of communities over the same topic (e.g. like seats in a congress/parliament) is a nice thought.
However, my second thought was how vulnerable that is in a fediverse. To continue the analogy, an adversary could create new states (server/communities) of arbitrary population (accounts) at will.
It’s the difference between knowing you’ll grow and graduate together with your classmates vs knowing you’re only going to see them for that one month before you move away.