To add another layer: It could also youself who might need such an 'cheat sheet': My dad suffers from an previously undiagnosed heart problem which escalated pretty badly last year, with a multi month long stay in hospital, coma etc.. He is now back and well, but time in a coma can do bad fuckery to your brain, in part to ones memory... He simply lost some significant parts and now he is pretty good occupied untangli…
A similar situation can arise under duress. On the contrary to what people claim online, in dangerous places you want to cooperate with criminals, not get in between them and your stuff. Under that type of stress it's very easy to forget passwords which might make criminals believe you're not cooperating. Having some things writen down (probably not all?) has come in handy for me personally.
But besides this, yeah, this may also be a valid case for some simple recovery strategy.