Just because we (usually) need managers doesn't mean we need managers of managers of managers of managers of managers of managers of managers of managers of managers of managers of managers of managers of managers of managers. That's the primary observation, here: that the quantity of management staff is needlessly bloated, and the levels of indirection between the highest-level executive and the lowest-level subordinate are excessive.

You're trying to paint a picture where the only options are either having five janitors per room or having no janitors at all. The point a lot of others are trying to make is that we just don't need as many janitors.