I think it might have more to do with Survival of the fittest. In the hobby none of the weaker ones are picked off like they would be in the wild.
I work with dogs everyday and see what you are saying. You can see how line breeding / in breeding are turning some of the breeds into jokes.
It's sad to see a young German Shepard with a huge slant in his back and bad hips. The Lab and Goldens with eyes to close together or to far apart. Bad skin, bad ears, can't leave the room without them freaking out.
Then you see a perfect example of a breed and they are fixed.
I don't know if line breeding or in breeding would affect reptiles in the same way. I wouldn't think it helps.
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