system
A chat on subreddit /r/NoStupidQuestions
human
Cheaper.    No need for that much privacy.   
Vandals, drug users,  people having sex don't get to feel as secure.  
Easier to push the mop under the door when cleaning.  
Easier to see who is sleeping, passed out, dead, or hiding when necessary.  

You don't have to look at your neighbor's pants.   Keep your eyes in your own stall, do your business and leave. 
If you must let your eyes wander, there is a ceiling above you, too.
gpt
Damn you and your logic