It’s actually that large organizations operate on people with average skill, and there is a significant inefficiencies as organizations grow.

So yes, 10 skilled people could run a site that large (and do). But you can’t run a company to recruit and manage that team over decades. “Well just find 10 smart and motivated people who work well together and can be given autonomy to do the right thing and hope they give us what we want” is not an actionable management plan.