That raises an interesting question. If a non-logged in member replies to a thread and then logs in, does his post remain? or does he lose it since he's noit registering as a new member after the post?
The way I interpreted the video was that the post would be "held" until the user either logged in or registered, then it would be posted after. For some of my users, who would appreciate the hand-holding, that would be more convenient. Especially the ones that enjoy mechanical rebuilds/discussions.