As I said, I am not a heavy IRC user, for my online chatting needs I mostly use Mattermost, Discord, and Slack. So I don't have an informed opinion on the technical merits of the various platforms---mostly I've heard that the Matrix clients and servers are quite a bit less robust than IRC ones but I've never personally used them.
If there is a feeling that GHC wants to use a new chatting platform, by all means we should try it out. I just don't think that the unfortunate situation with free-node is a good reason to drop IRC entirely. Despite its flows, I think it has served our community well, and while it may look "old" to "young" users it does have the benefit of being pretty stable, unlike the myriad of chatting services that seem to be popping up all the time.
-Iavor