No. You absolutely do not need to read all channels. Support is well support requests so unless you are helping or need help ignore it, off-topic is irrelevant, I ignore it 90% of the time. I maintain there was nothing of importance that needed to be announced otherwise I would have said so in my prior post.
If you have FOMO because someone might "leak" the 4.4 release name in a Solus matrix channel, not as an announcement but as part of a discussion for the best way they should address something... too bad. We are not posting every thought / discussion we have on the forums.
If it is important, yes forums or blog posts should be made and when it makes sense to do so.