[codeptualize]

I'm by no means an expert so take everything with a grain of salt.

Notary/lawyer/safety deposit box do sound like proper solutions. I also think 2nd factors like hardware keys, auth apps, also just multiple devices you have logged in, work well in recovery.

For after you die notary/lawyer sounds like the most solid option, they seem quite skilled and experienced with that kind of stuff.

Otherwise you need some other way to recover. Recovery email seems to work quite well, but could be another account, another type of log in, there are many ways; I've had some services send me a physical letter, I have gone to physical stores with my id.

Nothing is perfect of course, but the social one seems unnecessary complex and fragile.