Not entirely true. As an example, ditto.pub still supports NIP-04 with a warning sign, and in shakespeare.diy I could very well vibe code an app that supports both NIP-04 and NIP-17.

Btw, where can I see custom NIPs (kind 30617)? In the changelog it says Amethyst supports it.

We don't have a screen just for nips yet, but they will show up in the feed and notifications if anyone replies to your nip

Sure, 1 out of 200 clients. So, the DM fails everywhere but in that special client. Its not a good experience. Ditto has deprecated nip-04 as well. They will remove it shortly. There is no way back.

I just had a different usage idea for NIP-04. Instead of using it for private communication (which it is clearly had for), it could be used for teasing purposes, as an example to purposefully tease that something great is coming. As an example, a long awaited movie starts shooting, and the regisseur and an actor are talking using NIP-04, and the public only sees that they are communicating without knowing what they talk about. And a few days later, an official annoumcement is made.

I support Nip-04 because I want to spy on who people are talking to.

what's a starndard