I was thinking about some of the other ways limits have been handled, particulary in the Marvel Universe. Magneto for example is a classic example. His abilities have shown progression, at the beginning he was able to use his Magnetism Mutation to block bullets, magnetise his suit to fly, create metal projectiles and broadcast a limited EM shield. Nowadays Magneto can do virtually anything with Metal, he can manipulate it on the Subatomic level, control the organic minerals in someones body, (this was shown on screen, where he extracted the metallic minerals from the guard and reorganised them into weapons and of course, a platform from which to escape) extract Admamantium safely from Wolverine's body and even enhance his own body to the level of someone like the Hulk.
This of course was a natural progression, similar to how a Craftsman learns to refine their Craft. Magneto learned how to enhance his abilities over time. But the most important thing is, Magneto still has weaknesses. He isn't Invulnerable and when weakened his abilities cease to be effective. Whats more, something as simple like a distraction would work against Magneto.