Earlier quoted context omitted.
Compatibility with a real protocol, IRC, instead of just a marginal bridge. Mattermost will still splinter communities.
The "real protocol" sucks on ice nowadays. No conversation history, no offline message storing, no push notifications, absolutely none of the niceties we've learned since 1990. The whole reason the Slacks and Hipchats and Discords of the world exist is that IRC is a terribly limited protocol that many people have tried to hang enhanced functionality on top of and none have succeeded. Personally, I'm in favor of letti…
IRC is not a limited protocol. What is happening is that people are using limited computers and networks (smart phones) that aren't capable of the same thing a 1990s computer was.