[Personal opinion not writing as site owner: if you have something to say that is genuinely a continuation of the old thread, why not continue it? But new threads are also cheap, and posts can be moved around after the fact if we have to.
Officially I don’t believe we have a policy.]
@MichaelCule has been muttering darkly about key stuff that seems not to be in the new RQ. For me it’s always been one of those settings like Tékumel where there’s just too much stuff to grok. (Why don’t I feel this way about Traveller, where similarly there have been decades of material published in obscure fanzines? Jolly good question.)