Everyone believed the earth to be flat, until it was proved to be round. I don’t know how many people believe in truly flat organizations.
It is so not natural for organizations to be flat. It defies the order and hierarchy of conventional organizations. Hierarchy served a purpose for hundreds of hears. Then there was this invention of flat. And everyone was proud about it.
Flat organizations is a direct result of the mankind’s itch for solutionism. You don’t solve the rage of centralized power by obliterating the hierarchy and order. Like Democracy is not really the answer to Monarchy and Autocracies. Democracy is then a framework to maintain a quasi-state, a temporary solution to distribute power and wealth. Does it really help in doing that? not really. But in some way we convince each-other it might work for now.
Similarly , flat is not the solution for hierarchy.