User blog comment:Gekkou30/Why are comic book Heroes and Villains so weak?/@comment-4651179-20131021001333

The reason why characters are weakened is because making them as overpowered as they originally are would lower the interest in them. Why would I want to see Superman fight a giant mech if I he would be able to turn in into scrap in two seconds?

That's it. Is for almost the same reason why Superman's powers were greately reduced after Crisis on Infinite Earths. After it, Superman could juggle tanks, but before it he could juggle planets.