Sure, the more added content and service done to characters the better. Because of the scope of the game and vast array of characters, very important at that, not many of thems got the "full treatment". I would argue that even Ciri should have something more added (I think Geralt would be much more interested in what she did all these years) - but honestly it's nothing to complain.
All I'm saying, while Triss had a bit less screentime, than Yen, it's understandable from the story point of view. And she still had much more presence, than many other characters. There are much more severe holes in the character department than her. And these should take priority.
But it's getting off topic
POST MOAR EREDIN