Earlier quoted context omitted.
There are pros and cons to both models, e.g. I think recent french experiment with mandated 35hrs (I think) work week backfired pretty badly. I live in the US and know more than one person working a 6/6 cycle (6 month of work, 6 month of rest and travel) which they would never be able to do with old, rigid work arrangement. I think for skilled workers with skills in demand flexible work options can offer huge benefit…
Where are they and who are they working for? Outside of teaching, I don't know of any jobs that would permit that, and it sounds great.
I also have several friends who work 3 day a week (24 hrs) by choice so they have more free time.