Ok, an oligarchy of genuinely good rulers for each region and specialty...which is exponentially harder to ensure, because it only takes one to cause problems.
The point still stands that we're better off with a democracy.
That's more an argument to keep states small, for optimal internal governance. Interstate conflict drives states to become larger though so it's a balance.
this does not prohibit its discussion as a theoretical ideal model. It's true that benevolent dictatorships outperform democracy as long as they remain benevolent, which is not long.
The point still stands that we're better off with a democracy.