I don't think that's the argument. What subforums do is foster discussion on the theme. There have been more political discussions spawned by the politics forum than if it didn't exist and politics was left to the general forum. Same goes for sports, food, etc. I agree that the audience discussing the topics is smaller and that's a shame. I really wish people would make an effort to visit the subforums. It might seem like a pain in the ass at first but I really believe it will become second nature if you give it an honest chance.