See you think that's relevant. But it isn't. I don't give a cr*p about how she was in the books, the games take place AFTER the books. So she changed, became a better person that takes risks and genuinely love Geralt. CDP had 3 games to evolve her character, her attitude and her story. You can say whatever you want about how she was in the books, point is, who cares. These are The Witcher games. I love how some of you delude themselves into thinking that reading the books put you on a higher level when it comes to judge who the characters truly are and how they behave. Guess what, i played the games and read the books and i like Triss 1000x more than Yen. Sue me.
It is very relevant. You might not think so, but many others do. Knowing the history of the characters enriches the experience, because you know more about them. And, I have never claimed that Triss hasn't changed in the games, she has. And you know what, knowing her history from the books makes that change even better and more meaningful.