Armstrong made his way up meritocratically on the strength of his piloting skills, to fighter pilot then carrier pilot then test pilot then astronaut. Many reckoned they wouldn't've been able to pull Gemini 8 out of the spin he got it out of, or successfully find a landing spot for Apollo 11 in the boulder field they descended on.
Maybe Musk really is as skilled as all that. Or maybe he was lucky enough to make a lot of money once (with x.com) and hire good people. It's hard to tell since so few people ever get to try having that much money to play with.
Whatever are his contributions to the rocket design these days (it's obviously a SpaceX secret), one can't deny that his ideas for future of humanity are the raison d'être and the driving force behind the company. He obviously hires engineers smarter than himself to do the work; his own engineering skills only add to the credibility of the company and its goals.
Maybe Musk really is as skilled as all that. Or maybe he was lucky enough to make a lot of money once (with x.com) and hire good people. It's hard to tell since so few people ever get to try having that much money to play with.