I would guess the deeper reason is that the sky is blue. That makes it more useful to have good vision in red and green.

If we needed good resolution everywhere, we might have had eyes optimizing for different colors, four eyes, etc.

Also, it isn’t as simple as this article describes. The human eye can vary its focal distance (https://en.wikipedia.org/wiki/Accommodation_(eye)) over a larger range than the effect of color aberration, so the eye _could_ optimize for having optimal focus for blue light or vary that over time.

(https://www.osapublishing.org/josa/abstract.cfm?uri=josa-68-... indicates humans can learn to do that in the lab)