I've been in hotels with no bathroom door, but it has pretty much always been in tiny one-person rooms, where realistically there are not going to be two people

I've been in hotels with no bathroom door, but it has pretty much always been in tiny one-person rooms, where realistically there are not going to be two people in the room because they _would not fit_. I don't have a particular problem with it there. (In that case, the reason it's done is fairly clearly that to accommodate a door they'd have to make the room bigger.)