Sorry if my attitude seems crass, or insensitive, buy I spent most of my life working in science as a microbiologist, so I look at these issues perhaps, a bit differently than as a pet owner.
Depending if, or what you believe. BPs are either line bred mutant severums, mutant midevils, or a combination of both, or simple hybrids of ????????
They are not a species.
Needless to say, the extreme versions have severely mutated mouths, spines, and mutated bodies, the insides, and organs, of which have been crammed twisted this way and that.
Just as balloon goldfish are known to have had chronic digestive, buency and other health problems, for millennia, it's no surprise "creating a cichlid", considering "only" its outer appearance, and not the ramifications of what is done to the insides would be frought with the same issues.
Not casting personal aspersions, about what can or should be liked or not, but it should not be surprising that cancers, genetic diseases and other maladies would be the result of such man made manipulation and mutation driven endeavors considering only "cuteness".
Nature and evolution tend to weed out the weak and disease prone with the survival of the fittest.
Only in an artificial environment of an aquarium would these mutated animals survive as long as they do.
If realization and acceptance is there, that even in aquaria they may not live full lives, that may be acceptable.
Even with species created just for color like EBJDs, not considering what may be lost selecting only for simple looks, alone and not robustness seems to be problematic.