I think NWC is only for sending payments but I could be wrong about that. The problem you’re describing is that there needs to be a non-custodial way for receiving asynchronous payments like zaps, right? In order to do so, at some point in the process the Breez/Phoenix wallet node on your phone has to be reachable in order to serve the invoice to be paid, and there has to be some mechanism listening for a request to retrieve it from the receiving wallet and serve it to your wallet to pay it. That’s what LNURL does right now, and lightning addresses just utilize LNURL, but that all requires an always-on connection. So either the node on your phone would have to always be online, along with the corresponding LNURL server, or there would need to be some other mechanism to coordinate those payments asynchronously when to account for when your phone node goes offline.