its an issue because theres something wrong with their genetics
other balls dont wobble their head because everything is sound

when breeders breed morphs and some come neuro issues or health problems or physical abnormalities that most balls dont have then thats where the problem or issues lie because their letting money be on top of everything else instead of owrrying about the animal be it a snake or chihuahua or anything else because this happens with other species to as you pointed out...

but don't get me wrong i love how spider morphs looks just like everyone else and i dont want to come off as saying NOBODY should own a spider morph but I wouldn't want to own one just because if i do sometime in the future want to breed i dont want to produce anything that isnt breeding quality in my opinion.