This is not the case and clearly evidenced by the fact that Ciri has little interaction with Triss as well.
The reason the focus is on Geralt and Ciri is fairly simple. Ciri is a, if not THE focal point of the game, yet she is a character that newcomers do not know at all. Our narrative is thus focused on a character that many players had no emotional investment in prior to the game. Through the many interactions between Ciri and Geralt, we showed that Geralt cares deeply about Ciri which translates to the player understanding why Geralt is doing what he is doing and more easily relating to those feelings.
The same, incidentally, goes for Yennefer. The reason she is present in Kaer Morhen in the dream sequence at the beginning, is primarily because we need to establish that she is important to Geralt and thus why the player should care about finding her.
It is debatable if we managed it at all points throughout the game, but I did want to correct the presumption that we reduced Ciri-Yennefer interactions because of Triss or Triss fans.
Cheers.