This won't be valid for everyone, but I'm getting more and more convinced that most (a lot of?) people don't "work" work 40 hours anyway. I'm not even mentally capable of doing 40 intense hours of focussed work. Not saying I don't have other tasks besides coding/thinking in that time, but honestly not for the full slot of time. It just feels to me like some sort of secret we all share and pretend like it's fine, but…
If we "actually work" 32 hours out of 40 (80%), what is the likelihood that if we shift to a 32 hour max week, that the average person will only "actually work" ~26 hours (80% of 32) in this hypothetical future? What if at least part of the 20% is spent doing social activities, water cooler conversations, etc. that enable the remaining 80% to flow more efficiently?
Given humans are highly adaptable I imagine we will adjust to the new normal and keep finding time to mess around at work.