Some good points BUT.
What you have done is argue the benefits of SELECTIVE BREEDING, which no one will argue against, especially me with my selective breeding pastel obsession!
The line the snake comes from is not as important as it's physical appearance, how it's bred and what its bred to then play the largest part in what its offspring will look like not where the snake originated.
There are good grazianis and bad grazianis, good nerd lemons and bad nerd lemons (etc etc etc) no line produces consitantly amazing animals without good selective breeding. This is why the quality of the snake you buy and the quality of the animals you breed it to determine the quality of the offspring you'll produce.This is much more important than the tag associated wiht that snake, although it's nice to know it, it's not the most important factor.