Hi ! I could only agree about IRC. The fact is that Slack is for every human not only the developers. I’ve been trying to push many people on IRC, they never wanted to. Showing them Slack and the fall in :
- clean interface,
- synch on all the device with the same app : Slack
- chat history
- multiple integration by default
User want as its name implies to USE : not to configure and setup. This is our fun not their. That is why Slack is booming and so many people love it.