Perfect restroom layout

Because for men everything is a competition?

It would cost more materials. If they have stalls in a row, they would share walls. It's also easier to have all the urinals on one part of the wall due to plumbing

For some reason this really annoys me. Guys who hunch over and hide at urinals are so weird, "what are you hiding down there?". You need to stop worrying about people seeing you naked, it's not healthy. Nobody cares what your dick looks like, only you do.