I think you're thinking of all use-cases as corporate use-cases (i.e. places where ops people exist.) There's a whole larger world of hobbyist/personal/academic/SMB-intranet use of software like nginx, where literally no ops is ever done, and the load balancer is considered a "black box."
It's considered a black box because it's a black box. A hobbyist would learn to use the status page from time to time, if there was a status page. Instead, he's learning that software are black boxes and won't look for status page in his next endeavour.
In some cases, sure. In other cases, nginx is embedded inside some other larger software appliance, and you'd have no idea it's even there in order to think to do that. (Like Apache in in macOS's Server.app.)
