This.
It almost only applies to desk jobs.
Production workers can’t just work a day less and keep the same output, and if they can’t do it, people like me who are responsible for keeping the production running as part of their job(electrician in
my case) also can’t work a day less.
If companies wanted to do this, they’d have to hire more workers to give everyone a 4 day week. But all this would do is create more costs for the company