My point wasn't to go into that discussion. My point was that there are people who have decided they are not wrong and that's basically all there is to it.
People who believe the earth is FLAT, for example, can be shown all of the pictures of earth from space, the pictures of other planets, the movement of the stars, etc. and they still won't believe it.
The WoW devs actually dealt with a similar issue, where they simply stopped engaging people in discussions about class balance.
See, if a guy comes to the forum with the idea in his head that rogues are weak and need buffs, and that he is absolutely right in his opinion and that nothing anyone ever says will convince him otherwise, there's no point in discussing it with him.
He has already decided that the only possible conclusion to the discussion he will allow is the devs admitting that they are wrong and that rogues need buffs. It doesn't matter how many facts are presented to him. It doesn't matter if you show him both the hypothetical and factual math, where he can clearly see that rogues are parsing above every other DPS class.
He will invent any number of excuses necessary, he will run the discussion around with random bullsh*t if he has to, he will do ANYTHING but admit that he's wrong.
I suspect we're running into the same kinds of people here, and most of these people clearly haven't even leveled more than one healer to compare and contrast the performance of the two.
WHM is still king. Nothing has changed that. AST's buffs are such that they will help the party some times and do ABSOLUTELY NOTHING other times. These people don't seem to understand this concept, they can't seem to grasp how the entire toolkit of each class needs to be factored into the equation. They're only looking at the baseline heals and crying buff as a result.
Being the best healer in the game IS a unique role (and it's still by far the best healer to be). There's nothing left to do to these people except mock them a bit, then do what SE is already doing: ignore them.