I disagree. Having a “centralised” forum means that everything is a hodgepodge of relevant and irrelevant stuff. I would love to find all the relevant decisions and announcements of Ministry X, but I do not want to sift through every single crap that other Ministries have published.
Also, I *believe* that dedicated subfora might actually be an incentive for activity, because stuff would be neater. Why not give it a shot, and if it DOES NOT work, we can still migrate threads and disable them? I mean, it really would not hurt.