What does one really have to do with another?
And Superman fans have no problem with the Flash being faster, WW being a better fighter, magic users being able to hurt him, or MM having a slew of powers he doesn't have. It's really other fans that can't accept the fact that he may be the most powerful all rounder and strongest.
Why is he the one that has to have his status challenged the most? Or farm out most of his milestones (he can't be the first superhero anymore that the DCU was built around, he can't have a connection to the Legion, etc.)?