And this is the real truth of the matter. The above posters are correct, you do need knowledge of something to run it, but understand that business knowledge and experience is ALSO that "something".
Once you obtain certain scale, you can't do everything. It's equally ignorant to think an engineer can run a business top to bottom as it is to think an MBA can fully run an engineering company.
I so often read here MBA used pejoratively, but remember that most small businesses fail because they're run by people who have skills but no idea how to run a business. A major corporation needs both (and more!) skills.
Once you obtain certain scale, you can't do everything. It's equally ignorant to think an engineer can run a business top to bottom as it is to think an MBA can fully run an engineering company.
I so often read here MBA used pejoratively, but remember that most small businesses fail because they're run by people who have skills but no idea how to run a business. A major corporation needs both (and more!) skills.