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Hot take: Strongest creatures in the setting shouldn't just be clowned by PCs with no resistance.
(ttrpg.network)
Inspired by frustrating conversation I had. For those curious, that was the statblock of Caine, father of the vampires.
D&D 3.5 characters can scale pretty high
Not on a Superman or Wonder Woman level but I think you could make a strong argument that Wish fixes (or breaks) everything by itself.
My character that got most close to broken was a Master Of Many Forms druid, though I was playing with a group with two well skilled min-maxers who were ridiculous from the outset at level 3
Wish can't make you great, it can't do much more than the equivalent of about half a level, you need a broken character design from the start
Of course there's also support for epic level progression taking you beyond level 20. A druid at level 20 could face an army and win