For those that haven't cleared all of the current content, may I ask what is the concern of the Hyjal release? As far as I'm aware, you still need to unlock Hyjal via attunements which require doing the raids before it.
I don't think that he is. His statement implies that people think things are "game breaking" when they aren't. And since you claim that you have killed Vashj, then one can assume that there isn't anything "game breaking" yes? If there were things that were "game breaking", then the "objective" definition of the term would be that you would not be able to clear said content, correct?
Sure, there are plenty of things that can be fixed and/or improved, but I have to agree with the person you quoted - "game breaking" is not the proper descriptive term for those issues.