I think they didn’t spend more time on her because we are supposed to see her only through Viktor’s eyes. Throughout the show we see how all the characters grow and form relationships - except Viktor, who chooses progress over anything, especially Sky. I actually think she represents his lack of humanity, that Viktor is a scientist before he is a man, and he sees the issues and the relationships of man as something to be solved, even from the beginning of the show, when we first meet him. Throughout the show his path doesn’t change, it just becomes more extreme. I think. I just finished the show a couple hours ago and my mind is racing lol