Failure to understand the basics. Nostr is a RELAY system. The clue is in the name. Notes and other stuff transmitted by relays. You could take 100 databases and nostr would be the worst-in-class. It's not a database. Realizing this is incredibly empowirng, because you can let nostr be nostr, and let it do one thing well, and then you have almost unlimited flexibility to build a system.