That said, I'm not sure why this is always so popularly discussed in Eng forums. The reality is, our work is inherently async, and 90% of IC's could work 1 days/week if we magically squished all our work in that time frame. Many in practice get away with a 4 day work week. My company has a no-meeting Friday and I'm full remote, if I've finished my work I just quietly take it off.
So the reality is this: a 4 day work week for IC's means either asking them to work less or forcing them into a schedule they already had access to but opted to not take.
Why would a business be incentivized to have their staff work less or force them into an uncomfortable schedule that doens't adhere as nicely to the realities of parenthood or other adult commitments.