For those who say it would lead to a decrease in productivity. Well that is only relative to the 5 day week. And the 5 day week, only exist because of some archaic reasons. It is not some law ingrained in the universe.
And beyond that we can see that increases of productivity has not led to increase of leisure time, maybe the opposite.
And we know many people who work barely a fraction of the week, yet need to maintain this kind of presenteeism. It seems absurd. Will we be trapped in this irrational mindset forever, or just until a certain generations dies out?