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That's interesting because I feel the same but about Photoshop - having learned editing on Gimp. I'm curious to hear from someone who knows both well.

Yeah before Slack I was constantly getting interrupted with questions that could have been answered any time and random co-workers just wanting to chat. However, I agree with the analysis that Slack is good for immediate communication and communication that doesn't really matter too much. Before Slack we didn't really have a tool that fit that and so every communication was a co-worker walking over and interrupting whatever you were doing.