I would argue that an extra day off is effectively much more than 50% more "days off" for someone who typically only gets weekends off. Weekends are a miserable

I would argue that an extra day off is effectively much more than 50% more "days off" for someone who typically only gets weekends off. Weekends are a miserable day to be off if you need to run errands, or just want to go anywhere in public where crowds can diminish your enjoyment or even keep you out entirely. I take time off during the week for "appointments" at the park for precisely that reason - it's almost impossible to get a relaxing hike at some of my favorite trails on a saturday or sunday. The flipside is that it's much easier to hang out with your friends on weekends, because most of them are also probably off. So having a little of both is best.