Are you talking about IP addresses? IP address privacy is solved. Use a VPN or use Tor... tails... or qubes. Depending on your threat model. To do IP you need an address, and that IP address necessarily gets signalled to your IP peer. And if you don't do IP you are not on the Internet. Nostr clients shouldn't be trying to control every protocol layer. Let the IP layer software handle the IP layer and nostr runs on top of that.