The problem I have with the Slack model is that it becomes opt-in. Lots of Devs simply won't read the channels because they won't care what other people were do

The problem I have with the Slack model is that it becomes opt-in. Lots of Devs simply won't read the channels because they won't care what other people were doing even if that knowledge helps people to skill-share, coach, encourage or take part of the work off of someone else.