[101km]

As far as I can tell your linked study says that "possibly, long weekend sleep may compensate for short weekday sleep" in terms of mortality but says nothing about qualify of life.

You can catchup/reset but the days you don't sleep enough you'll do worse.

[gh1]

Yes, different priorities lead to different results. If you are looking at life satisfaction, then 8 hours a day is claimed to be optimal [0].

[0] https://link.springer.com/article/10.1007/s12232-016-0256-1