> literally the richest man in the world... extreme returns for his investors

This isn't really a benchmark for effectiveness at anything beyond making money.

I don't think anyone would dispute that he has an eye for investments (helped along by a healthy dose of the ol' silver spoon), not to mention a certain flair for convincing Uncle Sam to pick up the tab (i.e. a significant part of Tesla's growth relied on federal EV subsidies, and NASA heavily buying SpaceX launch capacity).