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burden is on you to demonstrate that we somehow have anywhere close to a good theory of how genetics work. we dont, it doesnt exist, because we dont know. your friends paychecks dont care much for science.
E.g. if you add a gene coding for an enzyme that turns molecule A into molecule B, most of the time there simply isn't a way for it to do anything, and the organism will usually adjust production of molecule A to compensate, so that there's barely even the tiniest difference other than it now producing molecule B.
we actually dont need the vast majority of for profit pharmaceuticals. billions invested in all political parties to make sure you think theyre the savior. thats why theyve banned antibiotics from anyone but an expensive prescription, create vaccines that get banned, and sell a lot of “mental health” drugs that tranquilize society.