I don't see any matching "complaints" sub-forums for the GE, etc.
There's a Tell Honda forum, but it has very low traffic.
I don't think that a sub-forum would make problem threads any more accessible or visible. It would hide those threads away in a neat little folder that viewers would have to track down.
The organization of the site is by vehicle system and then vehicle model, which makes sense for things like tires and wheels which cross over vehicle models. It does not make sense for problem threads since a problem with a GK is not applicable to a GE.
As time goes on, the number of problem threads will dwindle which will render the specific sub-forum dead. Few will post there because nobody reads it, and vice-versa.
Looking at it realistically, the newly-released car experience is pretty much either avoiding or dealing with problems. Keeping the problems to the forefront motivates Honda to respond more rapidly to them.