I agree that an owner/operator doesn't need to know details of how the organization's product or service is manufactured/delivered. The ability to hire and delegate the right people to deliver a quality product is essential. Some owners/ executives can be successful cross functionally between industries. We could see by Trump's revolving door of cabinet members that he wasn't competent with it. His first cabinet was far and away the most qualified, but they all got out pretty quickly. Trump had his nuclear family in there at the end as advisors, and very few seasoned executives in his cabinet.
Top line executives don't publicly insult those who may leave or disagree with them. Trump was anything but a professional executive