Sorry to nitpick, but Warren Buffett did not start Berkshire Hathaway, he bought an ailing textile manufacturing company in 1960s thinking he could turn it around. He could not, but Berkshire eventually became a holding company for most of his investments.

Warren Buffett is more of an example of meta-enterepreneur, that is he is great at investing in companies with great entrepreneurs (and managers).

Your original point still stands.