The whole idea that our lives should be divided into seven days chunks always seemed strange to me. If I'm "in a flow", 5 days is too little for me – I almost force myself to switch to "weekend mode". And two days of weekend is too short – I can't travel to anywhere, I can't switch so something else that requires another "flow". Basically, 5-2 cycle gives you sense of having some personal time without giving you any personal time.
Probably 10-4 or 10-5 would be more healthy and liberating in some sense.
10 continuous days of work would be horrible for me, as a programmer, and would probably jeopardize the health and even lives of many blue collar workers. While I think flexible schedules are a good thing, the default for most people is already too many working days in a row.
Fair, but I think the idea that everyone has to have the same schedule regardless of field of work (or even within the same field) isn't necessarily the best idea.
Probably 10-4 or 10-5 would be more healthy and liberating in some sense.