This is the thing people don't seem to understand. Yen doesn't need more screen time, Yen needs different screen time. I'm talking from the perspective of the plot in hindsight by the way. Yen is vital to certain parts of the plot. Triss, especially if romanced, is vital to parts of the protagonist's personal background and development. They're both equally important, just important to different areas of the story being told. What you have is, in effect, two stories running concurrently though this game. Geralt's search for his daughter and Geralt's relationship with both Triss and Yennefer. It's the love story that suffers from a lack of screen time with Triss.
She really isn't. She is pretty much irrelevant both to the plot of the game and to Geralt's development.
In fact her "romance" is analogous to Geralt's fling with Fringilla. Both happened under false pretenses and both ended the moment the waters became clean, with no fall out or impact on Geralt (apart from strenghtening his devotion to Yen). The difference is that there is no fanservice choice in the books.
Eh, at least in the books Geralt had consensual sex with Shani...In the books,but not in TW1.In the game Triss and Shani's romances were equally important.