An IRC channel would be nice for support and such, as many people use the platform, and are used to it. There are already a number of people in #phorge on Libera. We can register as a community and have full control over the #phorge namespace.
In T15032#943 @eax said that all communication should happen in the instance, but it would be nice to be able to communicate on IRC as well. While Conphrence is nice, I know I would be more likely to see a message on IRC, since the other projects that I work with are all on IRC.
At the same time we could also think about potentially supporting other platforms, such as (Telegram, Discord, etc).