I don’t think wallets need any kind of external service logins. And I generally dislike nostr, e.g. how relays work. I don’t think nostr relays can be reliable place for wallet backups.
But a separate nostr app with an integrated monero wallet and features could have some sense.
Do not give much attention to downvotes. There are many crypto haters over the network who will use their chance to downvote if they see a non-negative crypto related post.
r/Monero is a place of tribalistic circlejerk. I downvote promotional, tribalist or maximalist posts while upvote good informational and technical posts, news, etc.