[pikelet]

Just remember that beyond words, our expressions, gestures, and tone, are all important parts of effective human communication, and text lacks all of that. Subtlety in meaning or intent can change while still using the same words. Slack isn't formal writing, it's more casual communication between humans, and emojis just make it all a little less ambiguous. I certainly agree that you should try to be as clear as possible, and that overuse of emojis can be tiresome, but there are definitely situations where a simple emoji or two can make all the difference in how your words are perceived.