It is an organisational question whether a chat like Slack has to be immediate. What's needed are enough channels to split social "noise" from things which need

It is an organisational question whether a chat like Slack has to be immediate. What's needed are enough channels to split social "noise" from things which need a response so that everybody has a chance to see those things, even if they are five time zones behind or deep in a debugging session. The other thing needed are non-intrusive notifications. A small icon in the notification bar is enough for me, to do a quick check when I have the capacity. (I'm always wonder how those people with big notifications popping up on each mail can work at all, ...)