Yeah but instead of using their custom integrate that only works with LND, you this would work with any node, custodial and non-custodial. All damus would have to do is scan a QRcode to connect and it would just work.
Isn't this basically what LNC does?
https://docs.lightning.engineering/lightning-network-tools/lightning-terminal/lightning-node-connect
Discussion
LNC, commando-over-websocket and this proposal are all quite similar (encrypted rpc over a relay). It's just that both LNC are too complex if you just want to do basic stuff like paying an invoice.