For chief executives across America, Warren Buffett isn’t just an unrivaled investor. The Oracle from Omaha is a regular source of management wisdom that business leaders have drawn on for decades.

Buffett hasn’t been shy about sharing his views on how companies should operate. He has railed against corporate bloat, heaping scorn on PowerPoint presentations, meetings, overpaid board members and what he has described as “make-work activities” at companies. At Saturday’s Berkshire Hathaway meeting, he once again called bureaucracy dangerous and said many big companies could be run better.