You're talking about for example a company where we have one manager, employees/staff working in various departments, and probably cleaners. In this case, only a manager can't handle the work of the numerous employees alone let alone keeping the company and surroundings clean.This is what most people are interested on, but you have to understand that a business that is done with more than one person is able to develop better than a business that is handled by private individual.
But imagine having two managers in a company. Do you think that it's not a disaster?