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The „text different“ section literally describes what any other messenger does.
I've never encountered a mobile texting application that allows replies to specific messages, only replying to the entire thread in general
Both WhatsApp and iMessage have supported this feature for a while.
iMessage's version takes the message and makes a thread out of it, and then inside that thread you are only ever "responding to the thread in general". The good versions are WhatsApp and (now) Facebook Messenger (though I think the UX is still better on WhatsApp).
I was thinking only about 3rd-party messengers.

iMessage sucks.

Source: I stopped using Whatsapp a couple of weeks ago and moved go signal & imessage. Most messages are iMessage currently. Since i use iMessage that much, I have realized how bad it is compared to any other messenger…

Telegram has this. In fact you can only reply to specific messages as threads don’t exist.
Signal, WhatsApp and even Messenger have it.
Bumble as well, despite not solely a chat app
Signal and Matrix/Element do this.
How does this differ from what Signal offers?
> Inability of the operator to know "who is talking to whom". No third party could ever identify the participants, not even the server. No trace of any metadata.

Can somebody explain how this is achieved? How does the server know where to deliver messages?