I think the point is that once robots can do everything human bodies do and AIs can do everything human minds do, there is nowhere left for humans to go. Just like horses didn't find new employment when internal combustion engines reached the point where they could do everything a horse does but better and cheaper.
I think the horses were pretty okay with not being bred into slavery.
But there's a very, very big difference between "automate dumb task with unimpressive efficiency that beats humans because humans have to pee, eat and sleep", and AI supplanting humans in society.
Robots isn't an important step in that path tbh. Intelligence is, and we still aren't close, even when throwing entire hyperscale datacenters at the problem...
