Here's mine. Tagging. It's still incredibly hard to tag someone if you haven't seen any of their notes in a while for many clients. nostr:npub1xtscya34g58tk0z605fvr788k263gsu6cy9x0mhnm87echrgufzsevkk5s and nostrdb will hopefully fix this, if/when clients implement it. But for now, this is my largest pain point.