Founding a start-up with VC money, dumping the bag into someone else's lap, and then riding off into the sunset is a very different skill set from actually growing and running a company that is no longer early stage.
Look at Zuckerberg. He may have been good as a founder, but if he didn't have super voting shares, and if Meta's cash flow from their ad business wouldn't mask how poor his strategic decision making has been, he would have been pushed out as CEO years ago.