Tesla is an interesting case, because it seems clear to me at this point that Musk is both a disaster for the company in terms of actively hampering its growth and an absolute necessity for the stock price. Given that Tesla's market value is (or maybe was now? not sure) more than all other carmakers combined, it's not really justifiable on any fundamental level, since "completely taking over the new vehicle market" is priced in, and Tesla's growth... hasn't been reaching that.