Logs can be append-only, while clients can still show edits. These aren't in conflict.
It wouldn't have to be complex, either, and it certainly isn't useless (says me and a few other people already!).
Quick example: I recently typed out about 10 long lines of business development chatter in Slack, the first of which contained a list of prospects. I realized I left a few out in my list, and edited the message to add them in. Without editing, I'd have to have either posted the complete list again or added them in as a second comment. Editing the original message is simply a lot less confusing.
Personally, I would treat the chat like a forum post and take more time to confirm that what I was posting was accurate. I have never used chat as for business purposes though, so thanks for the insight.
I do wonder though, should IRC evolve to be like Slack or should it evolve idependently? I feel that the new features should be more vital, rather than "neat"... like maybe more focus on privacy and/or anonymity. Undoubtedly, I am just resisting change...
I think we're at the vi/emacs point of this discussion. Editing messages works well for me and my team, and we're glad of the feature. You don't have to like it, and I wouldn't force you to edit messages. The world supports both and we both win. :)
It wouldn't have to be complex, either, and it certainly isn't useless (says me and a few other people already!).
Quick example: I recently typed out about 10 long lines of business development chatter in Slack, the first of which contained a list of prospects. I realized I left a few out in my list, and edited the message to add them in. Without editing, I'd have to have either posted the complete list again or added them in as a second comment. Editing the original message is simply a lot less confusing.