Don't think that just because natural selection tended to favor a particular thing that it's necessarily a good thing. Some sheep have the most ridiculous horn

Don't think that just because natural selection tended to favor a particular thing that it's necessarily a good thing. Some sheep have the most ridiculous horns because of how they compete for mates. If, in some alternate world, those sheep became intelligent and lived in a civilized society where such a thing was no longer relevant the horns themselves might have little worth other than prestige. They serve no functional purpose. Humans have survived in spite of our relative weaknesses. We've got a seriously screwed up head, nothing in there is oriented correctly, and parts of our body are on the verge of self-destructing even at the best of times. We were never intended by nature to live more than twenty years, everything past that is actually quite unnatural, as everything in your body starts falling apart at that point because from the perspective of natural selection taking place fifty thousand years ago you've either bred and done your duty, or you're dead weight. There's a lot of mistakes in our DNA that time will correct, but we can always jump start that process by making a few tweaks today.