Just look at the view counts and reply numbers. Even the most popular threads only have 30 comments in them. This forum is practically dead. Using the built in Steam forums would guarantee people could actually participate and would be a MUCH better way to interact with the community (people might actually see and participate in the discussions) It's also very easy to create sub categories for Suggestions, Bugs, General, etc...and you don't need to open a browser or create a new login account to do any of that.
On top of that. Them saying this is the "official forum for feedback and bug reporting". I've made multiple posts in the last few days and haven't seen any confirmation that they even read this stuff....