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Engineering for failure is important, you should always set yourself up so that you have several lines of defence which can fail. Some lines of defence to make failing "impossible" others to make a fail softer, even when you think failing is impossible.

Defense in depth.

it’s more like blue m&m’s than an actual requirement

>it’s more like blue m&m’s than an actual requirement

Did you mean Van Halen's famous "WARNING: ABSOLUTELY NO BROWN M&Ms" clause?

https://www.snopes.com/fact-check/brown-out/

Probably. It’s an honest mistake. For Gen Xers and early millennials blue m&ms are memorable for being added in the 90s with much ludicrous publicity.