Because end game is what's carrying the game. If they removed m+, raiding and all organized PvP, the game would die. If they don't create new end game material, the game dies. WoW has always been end game focused. All class balancing is done at max level, all cool gear/tiers are obtained through raiding. If you want to be super geared, you won't do so by grinding old raid achievements. There's plenty of garbage content out there if you don't want to do end game content. You can collect transmogs, mounts, achievements or even do pet battles. If that's not enough for you, then quit. Just don't push that stupid player housing on everyone. It has no value in the game and doesn't make it any more fun. It would only thin out the world like I said.