Great user experience, compared to what IRC was. Especially for non-tech people, so it could span the entire company. Clean & simple Web UI, Drag'n drop file s

Great user experience, compared to what IRC was. Especially for non-tech people, so it could span the entire company. Clean & simple Web UI, Drag'n drop file sharing, rich multi-line text, beautiful colors/branding, session & history handling, search functionality etc. are just some of the thing that come to my mind. IRC had no consistent experience, you just needed to know what the best client is and setup bunch of other things. Functionally Slack might not have offered much over IRC at least for techies, but UX-wise it was a leap forward. It made chats approachable. And ofc the timing was right.