I’m with @Pied_Pfeffer that it can be a good thing to be able to get TP from a neighbor. Lol. Running out of paper happens less now with the huge paper rolls. When I was a little girl it happened more often. Plus, not I’m not 10 anymore and I check first. I was just in a restaurant bathroom last week and heard a women ask her very elderly grandma, as the grandma entered the stall, “is there paper in the stall?” The grandma said, “yes, do you need some?” The granddaughter replied, “no, I just want to make sure you have some.”
Plus, if the doors are shut, it can be difficult to know if someone is in a stall if you can’t see their feet. The locks on the stalls aren’t great, sometime we rely on the door just staying closed without the lock working. There is les chance of someone walking into your stall if you are partially visible.
Fancy restroom have full doors that are made well and usually lock well. It is more of a pain to know if a stall is empty. You basically have to knock on the door like you would a single bathroom, or you just try walking in and the lock stops you if someone is in there.
I was just in a bathroom with frosted glass store doors. It was a very nice bathroom. Maybe when someone is in a stall you can tell by their outline? I don’t know, it was empty when I was there.
Most Americans aren’t obsessed with who goes into bathrooms, that’s partly why it’s a hot topic. A bunch of us are saying being worried about it and making a law is stupid. Mostly, people are talking about it, because the media have it some PR.