Memorizing something like a seed as the only backup is an absolutely terrible idea. If you don't use it often, you will forget it.
Or what happened to me could happen to you. I have MS and had a really bad flare and lost some memories including my ledger pin. Luckily I had it written down in my safe and could recover my funds.
Human brains are squishy. If you got hit by a car, would you want your family or friends able to recover your coins? Because they won't be able to with a memorized seed.
Put 12 words in your safe and the other 12 words in a friend/family safe. No need for fancy Shamir secret sharing or anything like that.
We need to use ENS more. It's the only protection against DNS hijacking