> I don't think a home relay is sufficient because there are plenty of more complex situations it wouldn't cover. For example, I may post to a paid relay, but I cannot expect people to copy me in on a thread at a paid relay that they may not be paying for.

Sure, but in practice, people have to add tons "read" relays to download all notifications from everywhere to account for Nostr apps that are not following NIP65 directions yet (it's optional after all). The overcrowding of read relays breaks the concept of the preferred/home relays.

Clarifying that NIP-65 should only contain home relays is important.