[_jab]

The logical conclusion here would be to have no door for the bathroom, but to have specifically the toilet in a separate subroom.

But I don’t think this makes much sense anyways. The hotel industry is not one that thrives from repeat patronage, and “the bathroom has no doors” features rarely in marketing.

[ghaff]

Not sure how uncommon that is. Certainly a sink is often in an open alcove. The toilet and probably often the shower is in a subroom with a door.

Not sure how common sharing a room with a work colleague--especially of the opposite sex--or a family member who is a teen is. But traveling with friends, activity partners (hiking, etc.), so much of what's being discussed on this thread just isn't a real issue in my experience at least in most Western culture.