Marc Andreessen on how @elonmusk works: "He has an operating method that he's developed that I would say is very unusual by modern standards. I'm not aware of another current CEO who operates the way that he does." "The top-line thing is this incredible devotion from the leader of the company to fully, deeply understand what the company does and to be in the trenches and talking directly to the people who do the work." "Basically what Elon does is he shows up every week at each of his…