Messaging Layer Security Protocol Standard?

Have y’all seen the new MLS protocol standard published by the IETF the other day? Sounds like it’s a new method of encryption key exchange designed especially for group messaging with multiple people.

RFC 9420: The Messaging Layer Security (MLS) Protocol (
IETF | New MLS protocol provides groups better and more efficient security at Internet scale

If I remember correctly, MLS as it is requires a central authority. However, Matrix says they’re working on “best practices for MLS that will work without modification in a decentralized environment”.

Also, email, and therefore DeltaChat, has long used (Open)PGP. I think the question here is, what would MLS do that OpenPGP can’t, and what can MLS do better?