He knew how to run Tesla and SpaceX,
But does he? Tesla was started by other people. Under him they announced self driving cars, which are little more that upgraded cruise control. Use it for anything else and you are asking for a collision.
The poorly named "autopilot" is actually a pretty good ADAS. The hilariously named "FSD Beta" (where the FSD stands for Full Self Driving) is not even close. When someone says "I have a self-driving car...it's a Tesla" I have to hold back laughter. Musk keeps promising, then moving the goalposts, then promising, all while doing not much in the way of delivering. He promised "full self driving just about 6 years ago, and debuted the product just about 2 years ago. Can you climb into the back seat of your Tesla and have it drive you around town?
Only if you have very, very good insurance. And possibly a will.
By comparison, the company I work for began testing around 5 or 6 years ago. One year ago we began giving driverless taxi rides in San Francisco - at night and in a limited area - and just today we started 24/7 operations. The amount of work that had to go into getting here is enormous, and there are a lot of people ready to jump into action if something...anything goes wrong. That's my job now.
There is a reason for this. It's called Uber. They had a self-driving Uber (with a safety driver), and due to a number of factors it failed one night in Tempe Arizona and struck and killed a pedestrian. That was the end of their self-driving experiment. Both Cruise and Waymo (which has been operating for awhile in my area) put the brakes on everything and moved ahead extremely, extremely cautiously. If someone is even injured while in or around our cars - even if it's not our fault - it would be a huge problem. If someone lost their life? That would be the end.
Tesla? They use consumers as their beta testers. That's fine for a video game, but a 2 ton car that can kill someone even at low speed? Incredibly stupid. I've watched some of the videos of Teslas "going rogue" and just cringe at the "testers" reactions. I used to train our testers, and some of the stuff I've seen Tesla owners do would at the very least get someone being called back to the garage, immediately taken off duty, and have a long, uncomfortable conversation with an operations lead.
Tesla makes very good electric cars, they disrupted the automotive industry, and sent everyone scrambling to keep up. What they're doing on the self-driving front is downright dangerous.