In NA the stalls tend to be open above and below, never mind urinals which are just out in the open maybe with small "blinders" in between if you're lucky. Personally, I don't care, but I could see people being more shy in that situation.
In bars/clubs I imagine there'd be an issue of more people taking up stalls to hook up since you wouldn't need to be sneaky about entering/leaving the washroom any more, but maybe that's just trashy behavior that can't be helped anyways.
Home bathrooms are single-occupancy, plus most people don't have the room. They're definitely beneficial for higher volume places as add much more capacity for less space, and act as an "express lane" of sorts.