Just to nitpick, in the section after "On the other side, these following guards are more of a “you really shouldn’t do this” variety – much closer to a disable

Just to nitpick, in the section after "On the other side, these following guards are more of a “you really shouldn’t do this” variety – much closer to a disabled state in graphical user interfaces:" The second and third examples are safety lockouts [0] working as intended: Some system is locked in the off state to ensure safe access for technicians. Especially the padlock lockout is simple and effective: As long as you have the key in your pocket, you can be sure than no one is going to turn on the meat grinder you are cleaning. [0]: https://en.wikipedia.org/wiki/Lockout%E2%80%93tagout https://en.wikipedia.org/wiki/Lockout%E2%80%93tagout