Your point is correct if this were the single-player game candy crush. However, WOW is a social game with people; and humans are in general emotional. The desire to beat the end game and the frustration of not being able to are natural. The next course of natural actions is to either get good or quit raiding, to avoid frustration. Those who call for nerf in this thread is more about keeping the guilds and the game alive.
If I were the developer of Candy Crush, I would make 200 more levels, easier than the current level 100 for people to beat. And that’s how we got multiple difficulty raids in the later expansions.