I've also noticed a disturbing trend with pseudo on-call availability, even on the weekends, labelled as "flexible working hours".
Then there's always the "unlimited time off, we trust you".
Then there's always the "unlimited time off, we trust you".
But that's exactly why I want my 80% time to be officially recognized. I don't want to feel guilty or worry that I haven't justified my existence when I'm not there on Fridays. The contractual 3-day weekend means a lot more to me than an extra 20% salary with strings attached.