It's not an advancement on 11, 12 still uses 11, it simply fetches them over an arbitrary new comms layer that's basically a re-invention of Tor. Therefore its slow and prone to failure, and a total larp for privacy because it entangles comms and payments. It's only being pushed by minor implementations desperate for marketshare, that's why after years of false hype its vaporware.

NIP-69 pulls comms up a layer where it belongs, Nostr: https://lightning.video/bd926eaa77a9a1046afb12faabb268be925b01d952edc3ce19d092f258ea3572