Okay, cool. I'm not going to discuss things where an internet search and 10 seconds of reading time will give you a definitive answer. People can just look up "bitcoin qt and core" themselves and see that you're full of it. Same goes for "ux perspective on security models". Have a great life, man

I'll save you the time: Bitcoin Core (QT) does not use seed words or support BIP39, the most common standard for seed phrases. Instead, it relies on soft copy backups of the wallet file.