Marc Andreessen on Elon Musk: “I think probably the single biggest question in all of business right now is: why don't more CEOs operate the way that he does?” "The top-line thing is just this incredible devotion from the leader of the company to fully, deeply understand what the company does, and to be completely knowledgeable about every aspect of it." "To be in the trenches and talking directly to the people who do the work, deeply understanding the issues, and being the key, lead problem…