Wouldn't that be where the "good design in theory, but in practice, all the extra organs means just that much more can go wrong" bit comes into play, though? Twice as many organs to be struck by a single blow, twice as many reservoirs for infection to spread from, twice as much strain on the healing process, and so on...The thing about the biological redundancies is that if they really work the way they're described in Ethics, it should be impossible to kill a Klingon with something as simple as one stab with a dagger and yet we constantly see Klingons killed in exactly that manner.
B'Elanna ostensibly worried about such potential issues in "Lineage" (VGR), too...
DOCTOR: There's no valid medical reason to do what you're proposing.
B'ELANNA: I disagree.
DOCTOR: You want to delete entire DNA sequences. The genes that create redundant organs, for example.
B'ELANNA: They're superfluous.
DOCTOR: Those redundancies are there for a reason.
B'ELANNA: Does my daughter need a third lung to survive?
DOCTOR: Strictly speaking, no. But having it may be beneficial. Some geneticists believe the extra lung evolved to give Klingons greater stamina on the battlefield.
B'ELANNA: My daughter is not going to be a Klingon warrior.
DOCTOR: With all due respect, you have no idea what your daughter's going to be. What if she develops an interest in athletics? Greater lung capacity would be an advantage. The point is, there's no reason to arbitrarily remove genetic traits.
B'ELANNA: It's not arbitrary! It's preventive.
DOCTOR: How so?
B'ELANNA: That third lung could become diseased, couldn't it?
DOCTOR: I suppose.
B'ELANNA: Then what I'm suggesting is no different than removing an appendix before it becomes inflamed.
DOCTOR: Why tamper with biological systems that evolved over aeons?
B'ELANNA: Like curvature of the spine?
(Although, of course, her concerns ultimately turned out to be deeper seated and less rational than that, having more to do with the trauma she suffered being treated like a "monster" as a child herself.)
Didn't seem of any benefit to her when it came to weathering the effects of the virus earlier in "Macrocosm" (VGR), either...
TORRES: I may never look at food again.
PARIS: I thought Klingons didn't get nauseated. You have a redundant stomach.
TORRES: Well, right now, they're both unhappy...[passes out]
-MMoM

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