Well, the problem is, the bugtracker isnt a forum. It's not read by nearly as many people. It's not nearly as easy to use. It doesnt contain nearly as much information.
And with a name like 'bug tracker' one would think its for tracking bugs, and not for problems that wouldnt be considered a bug, but could be, for example, a individual server's hardware defect.
Why have these forums at all? What are they for if not for people to discuss problems? Why not just take them down if you dont want anyone to use them?