I don't think that was ever a requirement (nor should it be), except where the OP included personal information that one might reasonably not want in the Lobby. Given the way that threads often veer off the topic of the OP, there is no good reason for giving the OP veto power over a thread. And it would be totally unworkable to require consent from every person who posted in a thread, since that could be a dozen people or more in some cases.