Owen is probably referring to the old STK clan, which grew quickly last year and caused a lot of tension. However, some of that was due to poor moderation. SU has been perfectly fine, and there's nothing wrong with encouraging clans provided they do stay in the rules, which really shouldn't be a question anyway.
However, I dislike to make boards for things only to see them unused. While I realise that having such a section may foster clan activity, I would rather not create that until there is forum-based clan activity enough to warrant its existence.
In other words, you all can make your clan topics as you see fit, probably in Trainers Journal, and then if there get to be enough of them, I'll make a section just for them.
Sooo what I just said?
~Ikaru