It's not so much about realism as is about keeping the story somewhat grounded and believeable. Characters have to follow the rules of the universe they are in, otherwise is shitty writing, If the story offers no consequences for your actions than what is the point in having choices and paths in the first place if the end result is all the same?
First I want to state again, I'm not saying the dev is out of line for making the story they want. I fully believe a dev should tell the story they want to. Of course I also don't think that devs should go back and change things (this "Nicki remake" makes me nervous).
That said I don't give a fuck about believability or realism. I want entertainment which until Nicki left I was getting 100% from this vn. The dev may want to shy away from it but is damn good at creating hot depraved scenes.
You asked the point in it? To be entertained, if I want morals, consequences and deeper meaning the last place I'd turn is an adult visual novel. I know it's not a porn vn but the dev is really strong in writing hot scenes which I enjoy and is the reason I play this vn.
Everyone is different. I'm happy for those that love the vanilla path, but don't you think they would be a little upset if an li left because the mc was too nice?
I think this dev has talent. I wish no ill on them nor am I mad. Something I enjoyed is no more and it's just sad. No biggie.