I guess my question is, why use Slack at all when you have Quip?
Quip has chatrooms that work like Slack (or IRC, or any other group chat in the history of the Internet).
Quip has chatrooms that work like Slack (or IRC, or any other group chat in the history of the Internet).
So what's the different use case?
(I don't see Quip having such an advantage -- although Quip seems like a perfect fit for Microsoft's product portfolio... Hmm...)
Positioning can definitely hurt a product.