Attraction towards equilibrium is real, but that equilibrium is not a given. It comes from intrinsic biological constraints, individual preferences, cultural norms, ideology, habits and expectations. Even fixing individual preference, the aggregate preferences is structurally mediated (collective or individual bargaining, labour laws). Through all those factors there's path dependency and friction towards equilibrium.

The point is: "a society's willingness" is doing a _huge_ amount of work in that framing. This willingness is precisely what is up for debate when we discuss work days.

The whole of humanity is one big system of self-feedbacks. Equilibria are only reached with respect to constraints (otherwise there is only one equilibrium, which is heat death!). The more you zoom out, the more "givens" come up for their own analysis.