A week ago, a new sub-forum named Off-Topic has been created and existing threads been moved there. According to the description, it "is for discussions that are unrelated to MorphOS". Apparently, threads created or moved in there are not visible on the MorphZone homepage, which is most likely the reason for creating the new sub-forum in the first place.
So for anybody who were missing some threads you now know where they are, and for anyone who wants to create some non-MorphOS thread you now know where to do so :-)