Aside from the values you mentioned cashu got, the specific value Karnage, I'd imagine, is pointing out is that you don't need to know someone's zap address to send sats, you just need to know their nostr address which is already there / more immediate than their address (if they have one that is).

What does this mean?

When bring a friend over to nostr, or already have friends on here but on different clients, you'd sometimes poke them to make a zap address so you'd send them sats, depending on the client. So what happens is "hey do this, then do that, then.." etc, or reply on specific clients to have their zap address made and the sender dealing with 2 address to send money.

With cashu on nostr, as a send, you'd just need their nostr address and that's it. On the receiver end, assuming there'd be a nostr client that implemented all the 3 wallets and transfer system in a nice UX way that Karnage mentions, wouldn't have to do anything and just see that they've received money.