One of the themes of Star Army is Transhumanism. That we can make ourselves better and change our societies in the process. A part of that is how we improve our genetics. So it's not going to go away if we explore our themes. There are certainly right and wrong ways to do that. I think in the past we have explored some of those themes. We might do it come more in the future as well, if people are intrested in exploring them.
Another thing is that Yamatai is far from perfect. Speciesism is a thing. It tends towards being very controlled, authoritarian, and militaristic. It was very much run for the benefit of the Ketsurui clan (although that is fading a bit). Yamatai has done terrible things in it's past. One of the Taisho is explicitly lawful evil. However, that makes it much more real. And gives us seeds for future stories and plotlines.
Something to remember is that effectively all of SARP history has happened in the last 40 years. If the present year was 2022, Nekos were invented in 1984. In real life, the eugenics movement has been with us since the 1880's and while the 1940's was a defeat, it was by no means the end of it. We are currently in what I consider to be a sort of Neo-eugenics revival.
So while I think we certainly do explore eugenics, I don't think we glorify it. Transhumanism is going to have to walk the line between improving our genetics and eugenics. Those aren't the same thing, and part of what the stories we tell here can do is explore that aspect.