(sorry for my english)
Terrible main romance option design in my opinion... That option (to choose between Yenn, Triss or none) should be given at near end. Big content with Yenn as it is (she never appeared in a game before, not directly) and more for Triss, even if less than Yenn (cause Triss had muuuuuch time in TW1 and TW2).
But for sure, ya, Triss deserved more time. I've choosen the red haired, but only cause first i watched spoiler videos about the brunette in the Witcher 3 and didn't like her... Thank god i didn't regret that choice, cause i really didnt like Yenn while playing too. But imagine if i realized "oh my god, this second one is the one for my Geralt!!!". I would have to stay with the 1st or with none (the 3some scene). Well, after the departure of Merigold, i felt a great empty in the game, specially with that damn sad song, even maaaaaaany mission after Now or Never..
C'mon, this final romance option is for sure one of the most important stuff in the game, the love fate of our hero, and if choose Triis i REALLLY would like to see between both much more conversation... To my Geralt take a liiiitle care of her afterwards, the reaction of NPCs, the reaction of Yenn. At Kaer, "hey triss, how are things in Kovir? I missed You. I can't wait to all this end. To Ciri be safe and to stay with You, as i've choosen". We just have the well scene, right? Sad.