memes

This is always my response. Hacking a lot of times comes down soft skills, where bad people get you to give them your sensitive information. (Your pornstar name is the street you grew up on and your first pet's name, finding your mom's maiden name on facebook)

If someone is in an office, having a post it or notebook is a bad idea, especially if your area can be accessed by the general public (like front desk people, or anyone who takes walk-ins)

But for a person living alone, or with people they trust, having a hard copy in a safe place is really safe. The Online Scammer isn't going to break & enter into everyone's homes to get their post it passwords.

(And it gives them the ability to give a trusted person access if they end up in the hospital or something, without having to share that info 'just in case'.)

The threat is always greatest (if you don't fall for phishing easily) from the people inside your house. The ones that could steal your jewelry, cash, pick up your mail and open accounts, or just outright sit in your chair and access your computer.

In that case, even if you have a password manager, chances are good someone with physical access to you can find or figure out that one password. And like Bytemeister says, you have way bigger problems in that case.