Well, look at the leatherback, which to me I do not consider scaleless, but having smaller scales. Then look at the Silky bearded dragon ( Which I believe is the super leatherback?) and they do in fact have health issues and no scales, and look more like the ball python in the picture.
I would not compare a scaleless rat to a ball python, they may both be snakes but they are different kinds. The Lucy ratsnake has Eye buldging problems, so does that mean the ball pythons should to?
To me missing an eye is just as much a defect as missing scales.