Oh dear. Where to start 
Dunner generally do not have morph specific appetite issues. When poorly bred or weak they are prone to respiratory issues, and this not so fun thing they do with holding food in their beard. We don’t see that much anymore though within our colony.
Short snout/pug face isn’t a morph, it’s a full blown negative defect that can be attributed to consecutively breeding shorter faced/smaller head dragons together repetitively. It’s a negative trait and shouldn’t really be something one goes for in their breeding projects because yes, it does cause health issues. Brachycephalic looking dragons are a no from me.
Silkback do have more fragile skin, but when they are treated like china dolls, and lubed up with lotion or oil constantly it can cause more harm than good. That’s an in depth and heavily debated subject.
Leatherback animals have no issues. They are not more delicate than a normal scaled animal.
My favorite, translucent. All of those issues you have listed used to be common when the morph was first being established. Heavy outcrossing fixed most of it, and now it only pops up with close inbreeding and failure to outcross. These aren’t common problems in well bred animals, but extremely common in poorly bred specimen. Therefore it’s not really the morph it’s self, it’s the inbreeding coefficient. Outcrossing is important 
Witblits and zeros do not have any light sensitivity problems. They are kept exactly like wild type animals with no issues.