Disallows sending of any funds to quantum-vulnerable addresses, hastening the adoption of P2QRH address types

sounds like trusting "quantum" resistant algorithms, very early in the game, with more steps.

Renders ECDSA/Schnorr spends invalid

so, this would mean we don't have as big a bounty on quantum cracking at scale

potentially via ZK proof of possession of a corresponding BIP-39 seed phrase.

clever!