Got it. Yeah I just trying to think if conceptually, there could be cool use cases for generating new npubs for every message from an xpriv, where a service provider has the xpub. Like the Swan autowithdraw feature - they know it’s your pubkey but the rest of the network does not.
Discussion
Could do a DH negotiation and derivation for forward secrecy.
I know #[4] was thinking about doing something like rhis dor DMs
Not sure where it comes in handy for relays but the ideas are endless.