In the brave new world that's being built, the entire population (most of it) doesn't get to have true confidentiality if somebody is sufficiently interested in them.

Well, windowless bathrooms are not uncommon. And most modern construction has walk-in closets, which typically lack windows. Even so, a source of white noise is always prudent.

And leads to mold and bad air unless you are careful which people aren't

True, but only if you don't ventilate properly. And exhaust fans are also a useful source of white noise. Along with running water.