My big realization over the years working from home (both pre and post pandemic), with teams in differen time zones and with different types of workdays is that there just isn't a single best answer. Things change person to person as well as over time.

But yeah, working fewer hours a week honestly didn't impact productivity much at all, and moving the hours from a single chunk to mostly working at the right times for each type of task made things more sustainable. You can't always be flexible about this on every position, but when you can I genuinely think it can get you to where you want to go faster and more reliably to be loose and align with specific needs.