Go take a look at any class subforum on any site. If you pay attention to any class on these forums they all are complaining on the same subjects more or less. And no matter which one you try to reason with they all respond the same. They attack you and tell you you're wrong and explain why "their" class/spec deserves more attention/tuning/better etc. Or why their class/spec isn't doing as well/ as fun as X class/spec. There will be more than one person saying that the spec "feels clunky" or "MoP version of X spec was much better" or "this spec is missing something"
If every spec feels weak / isn't fun / is missing something. How can there possibly be "true" class balance without making every spec the exact same?
The players clearly aren't steering Blizzard in the right direction of class balance, I don't believe feedback from the playerbase when it comes to class balance is as helpful as it seems. Blizzard needs to do their own research and find out which specs/classes need what and stop allowing the playerbase to steer the game further and further from true class balance. The game isn't getting anymore balanced especially in PvP and the only type of balancing that is going on is homogenization.