Real-real time meaning other people see your message as you type it? This is a feature that would actually discourage me from using the chat. Having to control how your message looks while you're typing it is added stress for the writer and doesn't really give anything of value to the reader. Not sure why this is better than "traditional" chats.
That reminds me of split-screen BBS chats. Every keypress is sent immediately to the peer and echoed on your own screen as well. It was quite fun, kind of a collaborative editing session more so than just chatting.
That's fair and something I know will is a love/hate kind of thing. I think if you truly experience a conversation in this format, your opinion on the 'sensibility' of this approach would hopefully change, even if it's still something that's not for you.
That being said, we will have a feature soon where you can compose the entire message before sending it (the 'traditional' way).