You get to a point where it's impossible to do the work anymore. There's too much of it. You have to develop teams, processes, structure, etc. that delivers the outcomes you're accountable for with full knowledge that you cannot do them yourself. It's very different than doing the work and experience shows that fewer people are capable of doing it, especially with any repeatability. The working world yearns for effective managers.
I encourage you to compare the productivity of the modern multinational corporation to any commune in history. The people working in collectives are not stupid or lazy. It's not an effective structure.