I don’t think you’re wrong about the idea of micro-states forming, but I don’t see how a communist cooperative isn’t a micro-state by the same definition as well.
As far as cooperatives being naturally more efficient, I highly doubt that. Centralized structures are far more conducive to decision making. While your commune is still debating about whether both Marx’ and Engels’ birthdays should be a day off, the capitalists are already working.
Also, the idea that property somehow magically supports itself by virtue of being communally owned is complete fantasy. You clearly have no actual experience and are just spouting off a bunch of dogma you’ve read somewhere.