I think it's more effort for companies to manage it so in general they don't offer it. I have seen people negotiate a 4-day week, and take a 20% pay cut. In th

I think it's more effort for companies to manage it so in general they don't offer it. I have seen people negotiate a 4-day week, and take a 20% pay cut. In the end, their job didn't really change, so they were paid 20% less and either worked relatively harder than others for less pay, or underperformed relatively to others, so their career stalled and bonus was reduced.