The trope is a problem only if it's overused and traditionally it has been. I'm not trying to defend it only the witcher books.

The witcher books are artfully written and yes there are many times where they are very dark including themes of sexual assault. They are however not exploitative or used for the gratification of the author or reader.

No, they are not for everyone but in this case they suit the dichotomy of the world and show the journeys that Geralt, Yen and Ciri went through to become a family.

Don't project your personal dislike of something across an entire genre, that's pretentious.

The writing world is changing and Authors like Brandon sanderson can imply sexual assault exists without actually talking about it, this is becoming more common as are world's that it doesn't happen at all. I like this but nor do I think SA should disappear from the genre entirely.