Five years ago most entrepreneurs wanted to stay private as long as possible. But investor Dan Levitan thinks there's a good reason for companies to go public. Levitan, speaking at the Milken Institute Global Conference on Monday, said going public is a great way for companies to diversify who has a say in what happens in the company. In short, it leads to better governance, he said. As more companies take large checks from ultra-late stage investors like SoftBank, they also give up more control.