Ozimek is afraid that a massively shorter work week would have consequences:
Given how poorly it tends to be designed, the amount of paternalism that would be required to undo the health damage of the 15 hour work week would probably be fairly extreme. So this is my fear: the 15 hour work week leads to 25 more hours of eating, sleeping, and watching TV and thus a massive increase in obesity. To combat this, we see a huge increase in paternalism for all of us, not just those on the guaranteed minimum income. This is a society where both how we make our living and what we do with it is increasingly defined by the government, and I find this very worrying.
Earlier discussion of a 15-hour work week here.