This is a thoughtful reply. I will just say that the UK also has public toilets all over the place, and a desire for people to not screw & get high in the cubicles. Ditto many other countries. But I’ve never been anywhere else with this door gap problem, where no-one gets privacy.

I did once use a UK bathroom in a supermarket where the lighting was all blue, which makes it hard to find a vein to inject. But the doors still closed properly.