Are we humans? Or are we dancers?
Loved your thought experiment about over-estimating the human factor! You bring up some fantastic points and it is true, what do you do with a resource that is "... never swamped with meetings, is always ready to lend an ear, and never sleeps"? I made a similar argument when it comes to the RC position.
Maybe a way to consider the thought experiment is, how do humans evolve in this current work environment and how do we evolve with AI? For example, do we not only ask the AI to do the repetitive tasks we don't want to do but ask it to teach us more efficient ways of doing them ourselves.