The more coins locked-out for a long time, the better. Right ? 
No.
Security and availability is another one of those issues that I intended to write about, on the subject of using seed phrases with ostensibly strong passphrases. Re AlcoHoDL, et al. Have not yet gotten to it. In a nutshell: If you care about your heirs, donýt use passphrases! Use Shamirýs Secret Sharing to back up secret pieces in some way that mitigates risk of compromise while you are alive, but also has a high probability of surviving your death or otherwise incapacitation.
Well whenever you are writing further on this particular topic, hopefully you keep in mind practicality.
Not everyone is as technical as you, and the fact of the matter remains that the vast majority of regular joes (and the jane or two that is in this space) need to have simple as fuck.. and prefer to have simple as fuck.
In recent times, I had been making some changes to my security and back up.. and while I was making such changes, I had to make considerable adjustments that kind of caused rethinking and re-jiggering of the whole previous plan(s)... almost like a shit-ton of make-shift work.... and surely, even causing me to consider some future changes that I am going to make again, "when I get a chance."
The shit continues to be complicated as fuck, even when putting time into various systems that are in place and even changes that take place from time to time, and sure, Shamir secret sharing is somewhat new too, at least in terms of some hardware wallets just starting to allow for that function.. and some people have older devices (and systems too, such as paper methods)