But those sorts of threads are not theorycrafting, they may be partially (mis)informed by such voices, but they are not. They are, however, the most crude form of feedback that exists in the absence of well formulated theorycrafting.
Let's consider this: call these community voices Opinion Leaders. What would be the state of class design in their absence? Not only that, but what kind of behavioral changes would this allow for Blizzard?
Don't get me wrong, I agree with the premise that a lot of players are just parroting these opinion leaders. I do it as well, but I at least go in and experience the class to see if I go through the problems being pointed out.
So when Shaman community leaders are saying our survivability and self-healing is crap, that Wolves are in a shameful state in comparison to how they used to be in MoP or WoD, or that having Fire Nova as a talent in the same row as Hailstorm is useless especially when taking into account that Fire Nova is downright useless without a Flame shock spread mechanic... sure, writing posts on the official forums in such fashion might be non-constructive, but it's just a reflection of frustration because we've had these things in an acceptable state before, but now they've been re-added in a poor state that us - the masses - can't help but go "what the hell are you doing?" Nonetheless I agree and "parrot" such simple premises.