There is also the Peter Principle that states that people get promoted to a level beyind their competence.
However, I do not subscribe to the view that one can manage everything from a peach cannery to a hospital without in depth knowledge of the product nor the way it is produced and by whom.
As long as managers treat people like tools, there will be trouble. More so when senior positions are filled by political appointments rather than subject knowledge. And we all suffer for it.