> Hiring the right people to push the success of SpaceX and Tesla?
Probably this. Its not easy to do.
I think there is also something to be said about the singularity of vision Musk brought to these companies. Its easy to dismiss (and I haven't been a fan of him much since the whole Thailand incident) but its one of those annoying aspects that eludes the desire of developers' (i.e. the average reader of this site) desire to quantify everything.
It makes me think of the story of Steve Jobs after his return to Apple, where he called a meeting of team leads, made a quadrant on a white board with the edges labeled "desktop" and "portable" on the vertical, "consumer" and "professional" on the horizontal, and demanded the company only produce 1 product to fill each of the four squares, eliminating the rest.