I'm surprised that someone has pointed this out because it is 100% on point. The moment your economy is productive enough that it is not necessary to hire ever

I'm surprised that someone has pointed this out because it is 100% on point. The moment your economy is productive enough that it is not necessary to hire every single person, employers start firing people rather than cut the working hours evenly across the population, because each employee represents a fixed cost. Hence you either work full time or you don't work at all.