is remembering 12 words that hard?
But what if, you have 1,000 Bitcoins in your wallet, and you forget one word, JUST ONE WORD, and you have no copies of your seed phrase anywhere because "remembering 12 word is not that hard". You'll definitely know the true meaning of manual brute-forcing. Hahaha.
OP, have both physical copies, and digital copies. Put the physical copy in a tightly sealed pack, and store it under lock+key in a safe. Encrypt the digital copy in a USB Drive and place it in nested directories, with each layer encrypted, and with different passwords.
If it's the last word, you are lucky, because it derives from the previous 11 haha! It's a joke, I totally agree that we should never rely on our memory! Our brain is extremely vulnerable.