This is huge. It means the Bitcoin and Ethereum communities can now confidently ship the opcodes and precompiled contracts to check ECDSA signatures on P-256 in addition to K-256 curves, and stop worrying about possible NSA backdoors based on the chosen seeds (quantum computers are another story).
I turned out to be right in my advocacy years ago, here is my post: https://ethereum-magicians.org/t/eip-7212-precompiled-for-se...