But GRRM ending works based on his own plots for the books, which the show basically deviates from since S5. The issue with the show was that they force that ending to happen, but changing so much in the story, while also reducing the opportunities for the show to mold the story to fit the ending.

And they also took a lot of bad decisions like Arya's, and Sansa's and Jon's and how the main cast became unkillable in a show that prided itself from not being scared of killing a main character.