Relays use FOREST to retrieve missing notes from other relays — but this functionality can be extended — relays can examine the NIP65 metadata (list of relays) inside a note and contact those relays to retrieve the note content…
This way the user doesn’t have to establish new connections to get the benefits of NIP65.
Still doesn’t solve NIP65’s other problem, but I have a solution for that too. Saying syncing is bcash is idiotic non-sense Pablo.