Automation makes full employment detrimental if not outright impossible.

Say before tractors it took 100 men to farm enough for 1000 people.

With tractors 20 men can farm for 1000.

With automation 1 man can farm for 1000 if not significantly more.

Open Source Robo Communism is the way to go imo. Sure a handful of engineers have to maintain the robots, and build new ones. And a few jobs will remain human only.

But we could easily get to 80% of the population being free to make art and dance