You write to relay A, I respond on relay B, and you are not connected to relay B so you never see my response.
Discussion
It depends., Relays has sync too.
ny the way on the discovery of https://nips.be/5 aka nip-05 you can add you personal relays where you push to in order to your followers know where reach you. easy as hell.
You can publicly publish your relays list, I don't think it has anything to do with NIP-05 specifically, but NIP-05 identifiers can be used to look up the relays, yes.
when you follow somebody, your client could add this relay automatically if they have write it on their nip-05 verification. just this. although clients devs are working on weird twitter-like things and it is annoying.
Oh I see, did not realize there was a separate "relays" field supported on the JSON file. Yeah, that should be a high priority!