This was discussed the last time the forum was re-organised. There was a strong desire to not chop things up into lots of micro forums, to try to limit the number of different forums. Many regulars use the New Posts feature, so see all posts in any case. Thus we did not see a strong need for yet another general Zed forum.
I'm not one to cling steadfastly to the status quo, so if there were enough interest in an addition, I'm not against it. It doesn't really affect me, as I am one of those that use the New Posts.