I'm gonna say something that is probably gonna be unpopular, but I seriously wonder if there is any pure form of government that would work long term. History seems to point to no, and not even because they are bad ideas necessarily, but because we can't seem to ever get rid of greedy psychopaths that have the audacity, and short sighted people who just can't believe they have the audacity, and wait until it's too late to actually do anything about it. I hope I'm wrong.
Not wrong. All systems of government (and governance) are corruptible (including anarchy! sorry) and people will always find a way to be greedy and cruel and irrational and ignorant. That’s what “the price of liberty is eternal vigilance” means, as one tiny example of similar sage advice from moral and spiritual leaders throughout time, that every generation ignores as quaint until they rediscover it for themselves after it’s too late. The folly of mankind is eternal.