With Tesla Musk also made a number of decisions that almost killed the company. The difference is, the mistakes he made were primarily manufacturing mistakes that could be reversed (it was just a matter of not running out of time and money).

With Twitter there is no undo. When 80% of advertisers leave because of erratic governance they're just gone. You can get new advertisers to replace the old customers, but that takes a long time. There is no going back to Twitter before Elon. There is no vertically integrated first principles engineering approach to fixing Twitter, because on a fundamental level the interest of the advertisers, users, regulators and journalists are at odds. You can't make them all happy, and as Elon has just discovered, it is very easy to upset groups that are vital to the health of the platform.