I was referring specifically to NIP-04. There's an open discussion and HRF bounty on replacing it.
the problems with NIP-04:
https://github.com/nostr-protocol/nips/issues/107
potential solutions:
https://gist.github.com/staab/f8284af12450dbbdcead6e0c3ed95e2c#problems-with-nip-04