I think the problem was he started to believe his own hype that he was a super-genius that knew everything about everything.
I mean I don’t know the nitty gritty details of building an electric car or building rockets. But neither does Elon Musk. Which would be fine except that he tries to talk about these things like he does understand all of the details. Nobody knows everything about everything, it’s only an idiot that tries to act like he does.
But then he tries talking like he’s an expert in a field I am familiar with and it’s like… there’s points people could make on this subject, but that’s not one of them.