It's actually creepy that other contacts can watch you live typing!
I’m not sure how well it works in groups but 1-on-1 it feels more like a phone call than a messaging app; except it’s over text, it seamlessly transitions to offline asynchronous messaging if someone isn’t there and you can both “talk” (type) at the same time.
You could write in draft mode I think, and people couldn't see the result
https://dspace.mit.edu/bitstream/handle/1721.1/41180/AI_WP_2...
>Another useful comlink program is UNTALK. UNTALK is similar to TALK but does not work across machines. However, on a display terminal, UNTALK splits the screen horizontally and allows the two people to type at the same time on their part of the screen.