EzekielRaiden
Follower of the Way
Because the central tenet of a significant amount of the opposition to considering game-design in D&D is that, if something sells, it necessarily must be good, and if it is good, then it must be well-made.The questions of whether the game is mechanically balanced across mainstream PC builds, and whether millions of people enjoy the game, seem almost completely unrelated (because millions of people play in a way in which mechanical balance doesn't really figure).
So I don't get why arguments about the second are put forward in response to arguments about the first.