It's not that I want some additional feature, I actually want fewer features. The ability to name group chats and persist them leads people to treat them like chat rooms. The ability to send animated gifs means people send them. These apps very quickly turned from "alternative to text-messaging" to "full-blown chat room that wants push notifications each time anyone sends a message," and I don't want an app to ask me to enable notifications each time I open it.

I realize there are per-thread mute settings, but the whole experience of using these things is highly intrusive. At least with text messaging (or calling) we still have, to some extent, the social expectation that it is known to be intrusive, so people (in my social group at least) are less likely to text for frivolous reasons.