In the 10 years I have maintained a presence online I’ve tried in vain to get a forum system online which I’ve liked, was stable, integrated well with any kind of CMS (MT, PostNuke, Joomla, now WP) and have failed. I’ve even tried bbPress, which I can’t seem to get to integrate with WP without freaking out. I’ve shelved the idea of forums until bbPress gets better (meaning someone writes a plugin for integration), though I’d really like them for one site of mine.
That’s sort of a long winded way of saying, no, I’m not familiar with the practice. I wonder why they do it? It doesn’t seem like it has a purpose. Oh well.