Part of the problem is that, as Americans, we are still loath to “ban” social behavior that goes on with the consensus of communities.
This might, just to be fair, be a sledgehammer answer to a fly problem. This is an age in which a multitude of considerations makes it advisable to have no open facilities in any bathrooms unless there is but one toilet and a lockable room. Even decades ago I never understood why the boys rooms had to be wide open — it is beckoning on volumes of misunderstandings, because they wanted to deny surfaces for graffiti. Modern surfaces are easy to clean.
A few years ago, I spent a month working at an RAAF base. The latrines generally had on one side a few sinks, a few stalls with sit-down commodes, and a giant trough running the entire length of the other side. I haven't seen such a facility in America for decades, but it seemed fairly common in Aus. Even some civilian facilities weren't too different. It's efficient, if nothing else.