From personal experience. I was working in a factory producing food (sorry not saying what type). The "machine" producing and packaging the food was a huge 20m

From personal experience. I was working in a factory producing food (sorry not saying what type). The "machine" producing and packaging the food was a huge 20m by 3m by 3m metal box (imagine a bus). One end - raw material & packaging goes in, far end, packaged food comes out nice and neat. That machine's interface was a Windows 95 (YES!) German language version. I am not German. I do not speak/read/write German. It was in that factory's IT admin & support. Nobody in that factory's operations staff could read German. So the rule is "we never touch this machine - never EVER. Anything that goes wrong (sounds, visuals, etc.) we ring the bell, escalate, get the vendor in." Sidenote: For the youngsters, W95 was an OS by Microsoft, before you were born, and it did not have the multi-use/control environment (admin = god, user = cannot install sofrware, etc.) The machine had two 'terminals'. One ON the machine (physically - on the front of the 'bus') and one 'remote' (50m away) in an office, with a huge window where you could observe the machine. Both screens displayed the exact same desktop (Win95, German)(basically a single computer with two monitors 'duplicating'. Geniuses operation staff got bored looking at a machine with no error/faults (German built!) and installed a software that came along with adult video CDs (we're talking early 00's). Geniuses were watching porn on a machine that was worth many millions and was the production machine. When the geniuses were watching porn, it was being displayed in BOTH screens. Factory floor, AND office 50m away. Sound and all... So.. adding to your points: 5. System limitations and customisation/hardening (no need for extra software - just basic security hardening/configuration)(win95) 6. Uneducated users (employers installing video player from an adult video CD)