Why you should have a Brainwallet:

The most recent flood in Germany shows how a life can change in just a few hours. Houses torn apart and swept away. The people completely overwhelmed by the water masses and a failing government warning system.

https://www.nytimes.com/2021/07/16/world/europe/the-flooding-swept-away-homes-and-part-of-a-castle-in-western-germany.html

When people usually ask what’s the safest way to store your private keys, users here are referring to a hardware wallet + a metal backup. The recent events show how vulnerable physical property is to such unpredictable catastrophes.

I advise everyone to additionally use a so-called Brainwallet. You basically store your private keys in your own mind.

It may sound difficult to remember 24 random words in a specific order but it’s really not. From my personal experience it’s very easy to learn the words in four chunks that contain six words. Memorize a chunk, add another one and so on. Additional security is never a bad idea and maybe one day it could save your funds from being lost forever.