It is pretty common in Technology companies to have CEOs who are technically savvy, and who pitch in to help solve the difficult problems. I do not buy the "way below their pay grade" characterization. It was mission critical to Tesla to scale up production of the Model 3 (and solve battery production bottlenecks in the process). All hands on deck.
The question I would love to have answered by a Tesla insider: Is Musk an innovative, problem-solving help in these challenging situations? Or is he an aggravation and a distraction to the people who are solving the problems? Or maybe both!?!?
And that's not just a question about Musk... I spent decades as a "hands on" senior exec in technology businesses. Always thought I was bringing crucial value to the party when I dove into a problem and helped people get "unstuck". But maybe that was just my perspective.