My opinion is that you should remove NIP-104, whatever that is, and keep only NIP-17.
NIP-104 is MLS (a newish messaging protocol) over Nostr. @JeffG speaks about it here: https://youtu.be/PWKd9aoZ-Cg Looks very promising, but not ready to be implemented into clients yet.
Yo! 😜
Oh, it's that thing? Sorry, I thought it was the proprietary "private chats" thing 0xchat has currently. We need a new number with only two characters for the MLS NIP, please, it's very important. Hex is accepted now, by the way.