system
Given the following post, respond as if you're commenting on Reddit:
human
(DCU) How did the krypytonians evolve to gain all of their superpowers despite thier very sun preventing them?

To expand on this did they ever realize yellow light had the effect it does on kalel, and use this indoors to compete in games or make society more advanced?
gpt
Kryptonian civilization is insanely ancient and technologically advanced. They were able to save their planet from being destroyed while their sun went through main sequence from a yellow star to a red giant. Kryptonian superpowers evolved billions of years earlier while the star was still yellow.The superpowers were only maintained for so long due to a side effect of making the people incredibly fit and chisled. So while they no longer could fly or shoot lasers out of their eyes, they still found the superpower genes attractive. Much like how the peacock, which bred for beautiful plumage.

TL:DR Sexual selection.