fiatjaf on Nostr: "it would not be enough for Jones to update his settings with his new relay and all ...

"it would not be enough for Jones to update his settings with his new relay and all the clients would then grab his posts from there?"

Exactly, that would be enough. That is what I was calling "the gossip model". No one is doing that currently, except https://github.com/mikedilger/gossip and https://coracle.social/.