That feature is basically the same as 2-of-2 or passphrases, and the problems with 2-of-2 have been pretty well documented by now.
I did my own research and architecturally it is significantly flawed...
I use a geographically distributed 3-of-5 multisig + seed XOR and Smanir Secret Sharing as a secondary backup in case the banks get shut down again.
During lockdown, I couldn't access my Trezor for 3 months and that made me re-evaluate everything.
I agree that seed XOR together is a bad idea.
I'm currently playing with time locks using Miniscript, but only with small amounts so far because I'm not 100% confortable with it yet.
During lockdown, I couldn't access my Trezor for 3 months and that made me re-evaluate everything.
I agree that seed XOR together is a bad idea.
I'm currently playing with time locks using Miniscript, but only with small amounts so far because I'm not 100% confortable with it yet.