For the "irc is just as good as Slack, you should just use irc" crowd, Slack's mobile clients are pretty good. Ever tried to get a non techie person to use irc on a mobile device? Ever used irc on a mobile device? The experience is terrible.
Slack's clients also have persistence, as in shows the most recent history of communication.
Not everyone uses screen/tmux with irc (though they should).
Slack's clients also have persistence, as in shows the most recent history of communication.
Not everyone uses screen/tmux with irc (though they should).