maybe the problem is the 4day workweek. I worked 30h for some months and 32h for half a year in between always fulltime. People want to shovel one day free and then add a weekend but that creates all those sync issues and makes them just less productive.
But instead work 6h every day in intelligence jobs like programming. When I did that I had zero sync issues because in core time I was always there, I had no downtime during work. Effectively I got just as much if not more done than fulltime but still everyday felt like I had half the day to myself (going swimming ...). It is a worlds difference in quality of life (unless you have to fill the free time with other family work or waste your life on Netflix).
If I was an employer in IT, I would only hire 6h day workers (full pay). No breaks but no more than 6h 5 days a week. I can do 6h concentrated work almost any day with an afternoon/evening of other things. 8 or 12h only works occasionally on average when I work 8h I add more than the 2 extra hours of time wasting, because less satisfied/concentrated/happy.
If I was an employer in IT, I would only hire 6h day workers (full pay). No breaks but no more than 6h 5 days a week. I can do 6h concentrated work almost any day with an afternoon/evening of other things. 8 or 12h only works occasionally on average when I work 8h I add more than the 2 extra hours of time wasting, because less satisfied/concentrated/happy.