Clients have improved to a point of usability that is 9/10. (I mean it's not like telnetting into a pop3 server, it's like using Twitter or WhatsApp when I show client apps to some boomers)

I don't see why the protocol should improve all the time, it works.

We have social media, messengers, market places and integrated BTC/lighting.

The thing that has to improve is user adaptation. Businessman have to use marketplace, more people need to quit their X / Facebook / WhatsApp accounts and being their friends to install nostr apps.
On the messenger side, that works fine, although I honestly prefer Simplex.

But most people are addicted to shitter and so they won't quit.