The problem is that Game Of Thrones is supposed to be intrinsically political and anti-fantasy, meaning a game where you’re the hero who overcomes death a bajillion times wouldn’t be true to the source material. Unlike The Witcher 3 which had politics you could ignore, a Game Of Thrones RPG would have to constantly be in-your-face about politics because the property is about ideologies, backstabbing, and the iron throne. Back when the show was good, it was about people playing the game of thrones and the dastardly deeds and sacrifices they would make to end up on top of the series’ now non-existent ladder.
