The problem, in my opinion, is that most people stop at or before ‘So you use a passphrase’ which leaves them vulnerable to the most likely SPOF scenarios. 

That’s why we do it the other way around, start with collaborative multisig. If they want to learn more and be fully self sovereign later then go for it! But at least your bitcoin is more likely to be secure in the phase prefacing that then when you start all the way at the top of your list. 

 Maybe I’m naive 

But if no one knows you own Bitcoin 

And you have it in cold storage and your seed is secure

What’s the problem? 

 How do you know your seed is secure? What about inheritance? 

 Maybe I’m naive but if I stamp my seed on titanium and bury it in my backyard then tell no one isn’t that secure?