That's easy to do on Nostr with secure messaging protocols like double ratchet and probably MLS. Just add "create anonymous chat" in the UI. It's just that relays can probably figure out who you are if you also make other Nostr requests. Maybe need a different client and relays if you want to avoid that.

There is no need to hide your ID what you need to hide is your IP

SimpleX gets around the need for identities with the use of message queues. Are you talking about a similar system? Wouldn't a nostr-based messaging system ultimately rely on the npubs of the engaged parties?

We believe that if IDs and receiving/sending addresses are differentiated, having an ID is an advantage and it does not affect metadata privacy.

I'm not being critical of anyone's approach. Just trying to understand the different approaches being taken by the various projects.

True, but sometimes one wants an identity when messaging, just want to keep it pseudonymous and on decentralized servers.. so probably both would be good to have

Are there plans to add login with Amber?

This needs to be achieved in general, not just in DMs. Without subterfuges like Tor, which greatly worsen the user experience.

@Amethyst already did this it's working great, internal Tor plus Nip17 for Dms and Nip29 for groups is coming.

Exactly. It's like "Hey Simplex user, you want to come and do the same thing over here, have a worse experience with unreliable relays etc... AND tie your public identity, which you use for everything else, to it?" Nostr is great for private stuff, as in private property, not as in secrecy.