1) The free-market competition between different stakeholders to offer the best Nostr client, which is beneficial to consumers.
2) Scalability of the protocol commands more relays. We need plug-and-play (umbrel style) relays activation
3) UX around key-pair generation/ storage. nostr:note1gvd9gz2x8zjqph5kmyn9xjeyp6ulwkprqugv6rfhygjjt83hfcqsfkqan0