Look, I actually do agree that Gwynne Shotwell has been a key component in making SpaceX successful / curbing Musk's worst impulses / etc.

But don't you think it's strange that (assuming so much of SpaceX's success is owed to Shotwell) nothing like what SpaceX has achieved was achieved at her previous gigs? But then she goes to work for Elon Musk and suddenly...

Regardless, the point I'm making is not "Elon Musk wrote all the software at his various companies himself" but rather "the idea that someone who has founded / run / exited a variety of companies in very diverse fields but all of which are good at software is a very strong indicator that Musk understands software".