Ok, just finished the game, I want to make a long post about but I'm pretty tired, my opinion hasn't changed that much since, well, there wasn't really any interactions either.
In fact I'm even more convinced they had somehow decided not to include Triss as a LI in this game and later realized how bad this would play for some people so they hastily added something. I mean, she could have disappeared after she rescued Phillipa and the game would have been exactly the same, she does NOTHING, And I mean, literally nothing. You can't even trigger a conversation with her.
Pet chats with Ciri, nope.
Ohh we need to explore a cave, Phillipa.
Explore a lab, Yennefer.
Last climb, Yennefer.
I never even saw a single fireball being thrown.
And even in the epilogue, she just says like, two lines, not even in a proper cut-scene like the dwarf and the bard have.
It's like those visual novels that have a Main Heroine and then Side Heroines, and if you choose to pursue the later then you get like 1/5 of the content.