Messaging protocols are largely fungible these days, which makes them irrelevant implementation details. A major reason for the success of Slack is around the

Messaging protocols are largely fungible these days, which makes them irrelevant implementation details. A major reason for the success of Slack is around the end-to-end UX. It's not "perfect", whatever that means, but it has met important needs that the "well, we already have IRC!" portion of the world has apparently never dreamed of.