But like a kid who partied too hard senior year and found out his final project is due in a week, they seem to have woken up one day and realized they'd moved way, way too far from the source material, and then just jerked the wheel to steer it back in a straight line towards the intended book ending. Characters who've developed differently in the show than in the books? Whiplashed back to the book versions. The Night King taken down in a single episode, with no real understanding of what he was trying to do, or what any of it really meant. Dany destroying all of King's Landing, but instead of a culmination of increasingly morally grey choices as she takes the throne from a loved leader, she's murdering civilians who don't even like Cersei because a bunch of dudes kept saying she was crazy (or something).
Frankly I'd have preferred they just made up some hollywood ending that vaguely fit the direction they'd brought the show, instead of giving us all whiplash.