I often see (reported here) that they've said something on Steam. Do I just miss them saying it here or in a medium that is for all the public and not just Steam users? Seems an odd way to be going about things.
We try to spread the information around. The advantage of Steam is that 90% of our players are already on that platform, it's completely open (as in everyone can read our announcements and threads) and it's very visible to players who are considering purchasing the game (again, 80-90% of all future customers will come via Steam).
We usually also send out tweets, and our excellent moderators are very diligent about picking up our unannounced announcements and reposting them here. In addition, you get the Kickstarter updates — not that often, mind you, but there was one on Friday — along with my random posts on the forum.
No, we don't post everything everywhere, but with the help of our fantastic community the news spread pretty quickly regardless. I'm sure we could do much better, but with our limited time and resources, it's hard to reach everyone.