For the women's washroom the cleaners are required to shout Facilities! a few times before entering. It's odd though because women are in stalls and men are skin to the wind at urinals. But I do find US and Canada are becoming incredibly prudish. I've read even gyms are installing individual showers/rooms since the new generation don't like to be seen naked.
Even scents are illegal or not PC "this is a scent free workplace" signs are ubiquitous. But people in other countries laugh at how ridiculous that is.
I don't think wanting some modicum of privacy is "prudish". I don't want to use a communal shower. I've always found that creepy.
I remember my middle school was built right before I started. They built separated showers in the gym for the girls and a communal shower for the boys. I remember thinking that was so bizarre. I also remember literally no boys ever using that shower.
To think being around other naked people is creepy seems to fit the bill (not faulting you, but true).
Trying to equate taking a dump in public with using a common shower is very much considered prude. Of course the stigma attached to the term plus the subjectivity involved makes it fuzzy.
There's also nothing about unsanitary about public defecation. On the street, yes. But a toilet or latrine is no less sanitary when you take the walls down. It's just not private any more.
But some of those generations would be creeped out by women wearing pants and short skirts, men wearing jeans everywhere, and people talking openly about sex and menstruation.
That mindset of I don't like X so nobody else should either. And in a similar way for gym locker rooms some people are uncomfortable so the gym must remodel the entire locker room!
I'd caution against using a single situational anecdote and drawing conclusions about an entire culture. For one, it's highly likely that many maids in the U.S. (especially at a dedicated guesthouse or bathhouse) would also have a more minimized reaction to guest nudity and privacy. The experienced ones have seen some shit.