It's not like human variability would be lost forever, we can make and keep copies.
Gattaca's core message is that there is no gene for the human spirit, but in reality there probably is, behavior is highly genetic. Also consider that Vincent could have had a heart attack during the mission, that would put his actions into a rather selfish light.
My optimistic view is that an improved understanding of the mechanisms would lead to direct medical interventions, in such a world Vincent would have been able to have his heart properly treated.
I have ME/CFS from a genetic condition and I treat it by suppressing IL-1B cytokines with diet and medication. I was lucky enough to be able to figure this out and I would like more people to have this knowledge.
>> The Fourth Law of Behavior Genetics, as proposed by Chabris, Turkheimer, and others, states that a typical human behavioral trait is associated with many genetic variants, each accounting for a very small percentage of the behavioral variability.
I think a big part of this assumption is the use of Linear Regression in GWAS studies, the problem is that SNPs have a multicollinearity problem where the inputs are not independent from each other. That the results of these studies reflect that assumption should be of no surprise. I think using better math this stuff is more easy to detect.Biomolecular condensates: https://pmc.ncbi.nlm.nih.gov/articles/PMC9974629/
Take for example that we can read DNA and therefore have a list of every bioactive peptide that the body produces, we also have WGS so we can identify people with changes to these peptides. By using algorithms on these populations we can understand quite a lot about what these peptides do without understanding the mechanism by which they do it.
Basically I think humans taking our genetic code into our own hands intentionally is inevitable and the question shouldn't be whether it should be allowed or not but instead how do we do this wisely and when are we ready for which steps.