I’ve always known that our stall walls in the US were shit, but then I visited Sweden and saw how truly horrible we were.
Over there, there are no men’s rooms or women’s rooms. There are just several doors each to a private bathroom and so it doesn’t matter who uses which one.
I’m sure our “single room with flimsy stall dividers” design is the cheapest, plus it’s not as convenient for all the drug addicts and homeless people our society creates, so it will never change.