> Because the technical implementation already exists with the highest security guarantees in the world.

This is a tired observation, but I'll trot it out again: I don't care how "secure" my financial settlement layer is if it allows me to flush my net worth down the drain with a single typo. My threat model includes my ability to feed, clothe, and house myself, all of which are contingent on my ability to claw back transactions that are fraudulent or incorrect. Blockchain solutions offer me no relief.