The only place I’ve experienced this in the US is Red Rocks Amphitheatre. Some of their restrooms are exactly like you describe. Full height stalls (small rooms basically) with a shared sink area. Literally no one I saw has had an issue with it. You just go, wait in line with everyone else, and take a stall when your turn comes. No issue and no confusion. There is no reason this can’t be the norm in the US.
The only place I’ve experienced this in the US is Red Rocks Amphitheatre. Some of their restrooms are exactly like you describe. Full height stalls (small rooms basically) with a shared sink area. Literally no one I saw has had an issue with it. You just go, wait in line with everyone else, and take a stall when your turn comes. No issue and no confusion. There is no reason this can’t be the norm in the US.