But why not? Washing every other day takes too much effort. Underwear is small and packs efficiently. I always travel with extra underwear and extra pairs of socks.
IDK about nomading, but when dirtbagging you have an excess of time. If the sun is down then your day is done. In the winter especially, having chores to do is welcome reprieve from the cold and boredom. And bathrooms or laundromats are so awesome. Warm and dry and bright.
In my experience campsite bathrooms tend to be cold and wet. Bright, sure, but not a place I'd like to spend any time more than needed in. :D
Gotta find a walmart or especially target. They're saunas :)