I think the game without a romance choice at all with Triss sailing away to kovir was their vision for the game, they put the Triss choice in afterwords as more fan service than anything else.
If the game had been designed with a romance choice between Triss and Yen from day one there would have been a lot of back and forth between them both quest wise and storyline wise to allow the player to make an informed decision on who he/she wanted Geralt to end up with.
instead we got CDPR's vision of the game with no choice involved, the whole Novigrad questline with Triss was designed with the intention of her leaving. After that the next half of the game was focused on Yen.
This is why there is a block of Triss content then a block of Yen content, they were not worried about giving players a chance to get to know both women before making a choice because in their vision of the game there was no choice.
Only after feedback and probably some internal discussion towards the end of development did they decide to allow players to choose, unfourtunately they already had most of the game done with no choice so they did what they could for fan service I think.
If we do get a response i'm thinking it will be along the lines of " sorry guy's we had the option late in development to either keep the game the way it was with no choice at all or do what we could with what we had and allow the players to make a choice but fit it into the existing narrative as best as we could without rewriting anything done previously as that would not have been possible".
I think we may have to live with the fact that they just plain made a mistake on day one when they started writing the story. To be honest the whole flow of the game would need to be redone in order to do a choice properly and I cant see them ever doing that as it would almost mean a completley new game. I think they just made a bad decision on day one regarding Triss