[arnvald]

Whenever someone compares Slack to IRC I try to imagine my company, where 70% of people are non-technical, using some IRC client as our chat app. There's no way this would happen.

Slack was never meant to replace IRC, it was meant to be used at work. Why would you hide your email from your colleagues?

[myowncrapulence]

  Why would you hide your email from your colleagues?

..

  using some IRC client as our chat app

Try IRCCloud, it's extremely simple and much better than Slack in almost every way.