The problem isn't the words. Its creating and sticking to a maintenance plan.
Discussion
My point is that we have many people who know how to do this with passwords (password managers, 2FA authentication apps, etc.)
People can learn a similar method for their keys, they just refuse to do so.
What is there to maintain about 12 words in a safe?
Are they still there? Do they backup the wallet you remember they are for? Does anyone else have access to the safe? Are they a single point of failure or do you use a passphrase/multisig/another tool? When was the last time you attempted signing a txn? Is the safe at the same location as your signer?
Even more tinfoil hat:
What are the chances the safe was replaced with a replica? Where were you when you generated the seed, were there any cameras around? Was the tool used ever determined to be low entropy?
So true. I like that the Cold Card Q has notes and passwords now. I can review my notes when I start to doubt my setup, but I can also erase everything with a few presses of the buttons.