I fully agree. I'm not so happy about this "woman seperation" (Triss ->Velen/Novigrad, first third, Yen -> Skellige, second third) neither. I don't know why they made it that way, not giving the player enough information about Yennefer at the beginning (and people who don't know her no real motivation to choose her above Triss). It also avoids their expected conflict for a long time of the game while it ultimately stays unresolved (or better: becomes magically resolved but without any consequence) even after they met (just before the battle of Kaer Morhen). It's like CDPR wanted to avoid that conflict on purpose for whatever reason which obviously caused some problems, like Yennefer appearing too bitter first without enough context, less complexity for the different characters and their relationships and finally no chance for Triss to overcome her remorse and reach a new stage in her developement. We had a long discussion on the Yennefer thread recently talking about just that. Of course you cannot change that anymore. It would require the whole game to be rewritten.
But I do agree that Yen could use some more context and perhaps some more dialogue lines in Vizima, especially for people who don't know her from the books.
Well, I'm not sure if they can fix that without additional scenes and some real work to put into, at least if they want to make it properly. As much as I would see that coming to life I doubt it will ever happen to any bigger extend, at least not so soon. But well, hope dies last.