If you watch the EverydayAstronaut interviews with Musk it shows that he has a deep understanding of the engineering tradeoffs and design reasons for many components of the rocket, and in fact is being quite careful with what he can share due to not wanting to leak company secrets. In fact, some of the questions that were asked in the earlier interview were re-referenced in a later interview as having been considered and leading to design changes.

I think Musk is a smart engineering type who sees finance, PR, politics etc as just another engineering problem, with all the pros and cons that creates. He's had a ton of success in hard-tech fields just by not being an idiotic pointy-haired-boss in a world where finance and political people are repeatedly being put in charge of projects and companies whose tech they don't understand. This doesn't mean he is likeable, or someone you'd want to have a beer with, or moral, or anything else. But it does mean he is capable of managing a tech company better than most, if we use the success of the company as our capable-of-managing-a-company metric.