Blizzard sifting through feedback, everywhere, including here since its been apparent they actively browse here for quite some time, is part of the process. That QQ is one of the best methods to get there attention, because despite what they say, it obviously bothers them. Flying in WoD is a great example of this. Whining and bitching has an effect, hell I would argue that is what got them to finally start talking about the Bloods of Sargeras. I would argue its what them to temporarily do things to the phasing in Dalaran. Constant bitching on the forums about 1 particular thing tends to drown out the rest of the discussion, and while your response may be just to drown them out with your own shit back in the form of "Its just a beta!" there posts are still valid criticism and feedback that have an effect on the things that are applied to the game in the end.