You begin the game in the dream with Yennefer, having presumably slept with her, which CDPR have stated is generally to create attachment to her character, you spend the game's inception searching for her with references to the unicorn and her specific scent (well-known within the books but still.) You have ballads for Yennefer and Geralt, everyone seems to want them to be together and assume them to be together (which is fair enough considering, but even more pressure to make Yen feel 'right'.) Triss tells you not to go with her again, even almost leaves, the Rose of Remembrance is withered, further implying that Triss is no longer the right choice, Yennefer gets a tonne more screentime with Geralt, playing in the prologue, in White Orchard, in Vizima, in Skellige, in Kaer Morhen, in Novigrad, in the final battle, in the epilogue. Triss is in Novigrad, albeit twice and gets perhaps 4 lines in all of her time in Kaer Morhen. Yennefer gets two love scenes compared to Triss' one, Triss physically looks uglier, as her forehead seems to have become a sanctuary for stray wrinkles and creases (thank the gods for mods), Yennefer gets a lot cuter dialogue with Geralt than Triss - I loved the exchange of puns during the Craven quest, the comment about being thrown off the unicorn, the way the lighthouse scene with Triss was 90% crates and a ship, with generic scenes identical to those from courtesans spliced in - although I guess the romance of the elven baths in tw2 is pretty damn hard to beat, I would have liked at least some magic, uniqueness and romance to be there. The drinking scene with Lambert and Eskel that towards the start includes Yennefer too, the fact that for Ciri's sake breaking up with Yen feels cruel, Philippa's comments to make you feel worse about it, the way Yen is nicer to you after going to the mountain with Ciri, whereas Triss reprimands you, Yen kissing you when you return with Ciri, Triss despite being like a sister to Ciri having no meaningful dialogue with her, the inability to talk about Triss in almost any circumstance, no way to say you're not with Yennefer, only replies not answering questions posed, you are quite literally forced to say romantic things to Yennefer, 'you look beautiful' 'splitting up instead of searching together not my preference', the only person who mentions Triss positively is Djikstra, and it's stated that's mostly for his own gain - Vesemir just goes 'ah, I see', when the penny drops, and you cannot defend Triss nor your love of Triss from Yennefer's accusations other than to blame memory loss or say you won't grovel, nor to Philippa. Triss is entirely absent from Kaer Morhen in a time when she really should be there, the small amount of extra Triss content, those being the statuettes, are severely underwhelming as anything other than small diversions. Triss gets tortured and you can either save her at the expense of Djikstra and having to do more before The Play's The Thing, or let her finger nails be ripped out whilst hearing her screams of pain. She doesn't seem at all grateful should you save her, nor can you explain anything even along the lines of 'I couldn't bear you getting hurt'. There's even a quite frankly stunning ballad played about Geralt and Yennefer. There's other stuff but I'm just tired and rambling.
Yennefer just feels completely thrust upon us, with Triss getting a little screentime and a lot less consistency. Yen's main role is fine due to her relationship with Ciri, but still, I didn't expect Triss to become so much of a side character, with almost every single thing about Yennfer being portrayed as better and more right, and so little content on Triss. I was very much disappointed, but I never really liked Yen in the books either, too cold and calculating for a long-term relationship in my mind, perhaps in small doses...
And other members of the Lodge were not accused.