I agree. I won’t do four ten hour shifts. You’re just adding two more soul crushing hours to your day.
But removing one entire soul crushing day from your week, allowing you to sleep in, do chores or errands, go somewhere fun, whatever you want. You are less free to do those things with the two extra hours per day because the two hours are probably before or after when many places are open, plus you and any compatriots with whom you might want to associate are more likely to be tired from work. (I’m speaking of a hypothetical “you,” not necessarily you personally, of course.)
I certainly think 4x8 should be implemented as the standard, but until that happens, I consider 4x10 to be far, far preferable to 5x8, especially if you get to choose your day off. I’ve mostly worked 4x10 for many years and the few times I’ve had to switch back to 5x8 have been soul crushing due to how much opportunity and “me time” I’ve lost.
I didn’t know I wanted it until the first job that offered it, but now it’s a requirement I’ll mention the first time I speak to any recruiter.