[isthatafact]

> "let the market show us what's actually more effective"

I am not sure what are the mechanisms for that. Would that simply be what maximizes short term profits?

It sort of sounds like a suggestion to remove all restrictions on the work week so that the free market can choose the winning system.

Why not decide instead to take a more human approach where people can work productively and still have enough workless time to rest and be healthy and also have time and energy for hobbies, family, exercise, etc.?