Most of the Slack channels I use are used async, and I only have notifications on for 2 out of ~15 channels. Good comms culture was much easier to develop with Slack + [Something for docs] for the teams I have worked with. But I very much understand that teams are different, and different cultures work optimally for different teams.
Slack enabled "De-silo'ing". It became more efficient and convenient to ask a team, or knowledge group of something, instead of depending on specific persons. Easier to be flexible about which topics to follow or not. I.e. normally I don't interact much with the #ops channel, but Bill is on holiday, so I'm giving it attention this week.
