100% verifiable that apples aren't oranges.
Do Blackrock players go into those low geared matches at all? Even if they did, you would be just proving my point.
About PvE, it's mind-boggling that I have to say this yet again, but Burning Crusade never had RDF, we left it active as a bonus since we're on a Wrath of the Lich King anyway, but most players know the dungeons need more skill and coordination to do than what you'll get 9 out of 10 times putting together a bunch of randoms. That is why the queues are long, people who know the game aren't using RDF, they are creating groups the old fashioned way.