I think you hit the nail right on the head there my guy.
Also once the agricultural revolution happened peasants likely had much more unallocated than the typical office worker in the united states, probably by at least an order of magnitude. I'm not claiming it was a better life but there was a greater amount of self determination which is absolutely something we should strive toward.
Also your slippery slope argument is silly.
I would be surprised if individuals in a hunter/gatherer tribe used to work more than 8 hours every single day.
Most people also used to be in survival mode for their entire lives. That shouldn't be what we are aiming for today.
Then doing work isn't needed to survive anymore but instead only because you want to achieve something. That could be many different things for many people.
Who builds the houses? Who handles the power generation? Who maintains the roads?
Who builds, and who flies, the airplanes in case people would like to travel?
And that's just the tip of the iceberg. A lot of work goes into a functioning society.
We've largely automated and optimised many jobs into minimal work or non existance across industrial production, agriculture, all sorts of areas. There's no reason not to think we don't keep automating to solve the problems you've mentioned.
Crap! And i thought i was anonymous here.