Labeling something in every way imaginable is basically a free way to reduce the long tail of errors.

I think there's a wide gulf between that and "treat literally everyone like they have the intellect of a toddler" kind of policy making which you see advocated for a lot on Reddit (less so here, but sometimes). McDonalds definitely does that, but my impression is that it's more of an acknowledgement of things getting missed in that kind of work environment than people being stupid. When two school buses pull up and you've got every machine beeping and buzzing things need to be stupid proof.