I think this criticism is fair to be honest and is one of the things that’s sort of swept under the rug a bit in discourse about Witcher 3. I definitely think the pacing is off just as you mentioned. I’ve heard other people regret their choice of Triss because they had basically locked in her romance already by the time you start doing stuff in Skellige with Yen and start seeing what she’s like.

Personally I think the Yen/Geralt dynamic is a lot better than with Triss, although it’s got its own troubles (nobody is perfect). I like the banter between them and they feel more like a proper couple.

The game as a whole also flows better with Yen as your romance choice in my opinion and to me it feels more like the Triss romance is an afterthought yes. A bone thrown at those who desperately can’t stand Yen.

Geralt (in the books) is deeply in love with Yen and is also bound to her by literal Djinn magic, so it makes sense that he’s always hot for her in the game and I think the attention paid to the Yen side of things is a desire by CDPR to anchor their game in the preexisting lore.

If you’re not dead set on Triss or wildly opposed to Yen I’d say go with it and do the Yen romance. It’s very suitable for a first time playthrough imo.