I'm thinking more like the movie Gattaca. Like, direct health and virility markers can be selected for and/or engineered in to create the best possible humans. Because that basically is the final frontier of human evolution- we can only control our environment so much, and the last thing we have yet to control is our own building blocks.

In theory we could be testing for genetic markers for everything: intelligence, strength, temperament, immune response, life expectency, disposition towards addiction or cancer or color blindness or depression, and breeding up the average. It's not at all clear how practical that would be even in a perfect world, where the lines of nature meet nurture and stuff like epigenetics has an impact, and there's no ethical way to pursue that.

Yeah, look at pugs and tell me humans are capable of the kind of careful long term deliberation needed to decide the genetic future of a species.

And even that framing has too narrow a scope. Can't separate you from your microbiome, can't separate an organism from it's ecology. If you could somehow have a eugenics project free from prejudice (fat fucking chance), you run into the problem that a eugenics program would be an unrealistically complex and long term undertaking, prone to terrible mistakes even from the most well meaning practitioner.