I'm a fan of mixing this idea with something like 1Password. Obviously depending on the application, the security increases or decreases. My approach is to memorize multiple base passwords though & then mix it with some random gibberish. So I might write my password down like this:

KXl2h!H (H)

That would tell me that the password is KX12h! plus whatever the base password for H is. My hope is that unless someone was really targeting me, I would be skipped over as not worth the effort.

This way, even if someone broke into 1Password or one of my other password managers, they still wouldn't have the password.

The part I struggle with most, is how/where to store these & Authy/Google Authenticator tokens in a manner that they can be delivered to specific people in the case of my death without decreasing security.