Earlier quoted context omitted.
who wants to sleep in a room full of shower steam?
That's a comfort issue. Comfort is important, but it's distinct from hygiene.
> it's distinct from hygiene.
MoldNot to mention that any bacteria thrives in more humid environments. They aren't so good at keeping moist. This is true for a lot of things, especially the smaller the thing is, including bugs. Higher humidity definitely makes good hygiene more difficult.
Why do you think bathrooms have fans? That'd be a lot of effort to deal with farts.