As a possible returning player and if I was to go live, why not have an separate forums categories each forum?
Wouldn't mind seeing them try to create them. Even if they aren't used a lot i think it's worth having. Would especially enjoy a moderation-lite forum.
My experience with them when they did exist -- admittedly long ago -- is that they were primarily used to accuse other players on that server of cheating, training, ksing, or duping.
I wish they would split out the class forums. It would make searching for relevant posts easier instead of having to shift through three other classes stuff.
The same reason they do not have class sub forums; They do not care about what their customers want, take it or leave it, it's about how they want it.