I believe attention is one of your most precious resources. If something else controls my attention, that something else controls what I’m capable of. I also believe your full attention is required to do great work. So when something like a pile of group chats, and the expectations that come along with them, systematically steals that resource from me, I consider it a potential enemy. “Right now” is a resource worth conserving, not wasting.
~ Jason Fried
Certainly there are situations where real-time chat is the right tool. But I think real-time chat is the rare case.