That's not true.
It's there for people to participate in content. It's there to provide players with different things to do in the game. MoP is in a very good place when it comes to this - pretty much anyone and everyone can make their "own game" and pick their personal variety mix of things (leveling, daily questing, collecting mounts/pets/transmog gear, running dungeons, doing PvP, raiding on various scales of difficulty - you name it; and last but not least, gearing up your toon) they like to commit their game time to. And that's great.
And I have to say: after all these years of stupid bickering and arguing back and forth I still don't see how it hurts anybody that some people they don't have anything to do with get to do a watered-down instance and collect some low-quality loot.