I've been in an org like that, run by an untreated bipolar guy who genuinely was a visionary and very very smart. We also had to work around the guy, but he was also very much the straw that stirred the drink.

Just the fact that companies had to have Elon Rules to prevent sidetracking doesn't necessarily mean he was a net negative if his talents lined up with the company. He is obviously taking a giant shit on Twitter and it plays to his worst instincts though (for fuck's sake, using a picture of yourself in a meme is as lame as wearing your own band's t-shirt).