Fair comment @HAWK , it is a funny one. With so much discussion in other areas of the forums it's likely the topics are already being covered in one form or another. My parade is totally un-rainable so don't worry. I think you're right in that this works fine at the minute for the low (zero) levels of related discussion.
The only restriction in the current format is that, to start a fresh topic, I have to do so within the confines of an existing thread. As an example, I want to ask how everyone currently doing the course(s) are finding it, but it's quite a handbrake turn of discussion topic from what we've had so far. Whereas if it was a category, I could just start a new topic about it.