PRS are useful but not definitive when it comes to phenotype development, as you’ve hinted at, but I take issue with using them for eugenics purposes with the main reason being we do not know the underlying causal mechanism. It is too early to use them with confidence for something like this IMO.
I work with PRS and I am not confident in using them for IVF purposes (that may change when we understand what’s actually going on the proteomics level). I would equate it to something along the line of sports betting with the consequences being eugenics in nature.
IIRC a CCR5 deletion leads to HIV resistance, but the homozygous allele also leads to immune transcription disruptions. I believe there was a Chinese geneticist that deleted CCR5 from twin embryos and got “disappeared” for it, but it remains to be seen what the consequences of that change are (I don’t remember if those embryos were implanted).
I’m of the opinion that we should approach this topic with caution until we know exactly what’s going on and the consequences of said alleles. Hypothetically speaking, imagine being born and chosen by this IQ method only to realize some horrible consequence later like asthma susceptibility in a world with decreasing air quality.
I’d be extremely pissed lmao. I could still find happiness even if I was less intelligent.
There’s another discussion about genetic homogenization that I don’t care to go into atm too.