I have zero problems with hierarchies, as you say, hierarchies are natural and necessary. The issue comes when people get so addicted to a particular hierarchy (in this case, one that doesn't even exist) that they can't function if it collapses or is subverted. However, I would say that you're absolutely wrong about communities full of highly self-motivated individuals not achieving anything. Those phases of society tend to be the strongest and the most resistant to subversion. By the time dictators become necessary things are already pretty much lost. Very very few societies in history have bounced back from the dictator phase and recovered their initial vigour.