As for your other point, does the best thing for a career have to make it _materially_ better? For me personally, the time off and self-reflection has been a better learning experience than if I hadn't quit, especially the ideas regarding agency and productivity, and these are things that will stay with me into whatever I do next.
I don't doubt that people with 40 hour workweeks can do the little that I've done, but if you see the goals that I set out for myself these were just a minor aspect of what I wanted to accomplish.