I know that we have http://socialhub.network/ for this as well and I encourage the devs to use these places in conjunction to this one for conversations for historical and open discussion reasons.
@jalcine Agreed about email, but IRC's lack of built-in support for accessing messages missed when offline makes it suck unless everyone is in the same TZ, has reliable power, network, etc.
@mjog Most channels are logged - the history bit was a solved problem. Also IRCv3 patched this bit re: history via capabilities. Just needed clients to implement it.
And the mailing list gets less random queries than the IRC channel, mostly I assume, because Mailman's UX is a mean in-joke.
So I suspect that IRC+lists are great for people already established with the project and/or familiar with the tools, but everyone else could use an easier means to communicate with libre projects.