Let me make a real-world analogy. You’re ten years old and you’re playing a pickup soccer game with your ten-year-old friends. A thirteen-year-old (maxed skill trees) shows up with cleats on (OP gear), asks to join your team. You can’t say no, for obvious reasons. He then proceeds to hog the ball, never passes to any of you, decimates his ten-year-old opponents, and basically leaves you and your friends standing around with nothing to do.
How is this enjoyable for anyone other than the thirteen-year-old?
In what world other than gaming could this possibly be considered morally or socially acceptable behavior?