The impact being that Kojima stops including wankbait waifus in his games.
You can disagree that just because a creator wants to include something that it should be included, but the "let the creator do what he/she wants" is a relevant argument.
My impact is just that I hope that people is more thoughtful about how things are depicted in art, both as creators and audiences. I don't really seek to make a greater impact than that, and it's a secondary priority to just expressing myself, which you ignored in favor of focusing on that one thing.
I feel "you can disagree with the creator" is an overly simplified way of describing my feelings to what Kojima does. It goes beyond a mere disagreement, it's an active derision of choices he makes because they're based in ignorance and obliviousness at best and active malice at worst (I don't think it's malice, but it's the worst case scenerio).
Lets replace what we have here with a different but also unpalpable topic.
Lets say that Kojima was racist instead of sexist. Lets say that every black character he made (and lets say he made a few in every game), he made a running joke about how they like to eat watermelons, fried chicken, and drink grape juice. And lets say he's not doing it out of malice. He still gives them unique characters, backstories, all the shit he gives his female characters. But, without fail, every game makes a joke about how black people love those foods, to every black character, because they're black.
All the same arguments given here would apply in that situation as well. "As a creator, he has every right to create what he wants", even if that's a racist caricature. "He's not harming anyone, I can tell the difference between fiction and reality!" All true as well, he's just creating a space where it's okay to stereotype black people. "He's giving them character arcs and backstories and everything, so he doesn't hate black people!" Yup, he only views them as black first and people second, and all black people have these traits he assigns them in his games.
If you would defend this decision with the same space of creator's rights you defend Kojima's choice to sexually objectify women, then atleast your consistent. But I disagree with that, and I do more than disagree. I think it's wrong. It's a wrong action that I don't think should be regulated, like artists should have the ability to choose to sexualize women, or do horrible things to black people, to muslims, and so on. Art is where you can do stuff like this freely, however horrible.
But while I can defend Kojima's right to do what he does, making that action deserves more criticism than "Well, I disagree with that."