The thing that people like Elon sometimes forget is that most companies have far less room for first principles multidisciplinary problem solving than for the people who then implement the plan that comes out of said problem solving. It can still be helpful but it comes with the added cost that every time you ask someone to do a task you have to explain the entire decision tree that lead to the task, and then even if they do come up with a valid improvement you probably have to throw out a bunch of other decisions that other people are already working on implementing.