That's a different argument. The person working on the engine should be the best qualified person to do so. And similarly for the other technical areas. Nobod

That's a different argument. The person working on the engine should be the best qualified person to do so. And similarly for the other technical areas. Nobody said anything disparaging about the need for sales, communication, or relationships. Only that in those respective fields you would also probably want the person who is most qualified, no?