I spent the whole 8 years telling my wife the Night King would be defeated by the lame sci-fi trope of kill the queen bee, the workers die.
and sure enough, lamesville, that's exactly what we got. The Night King battling his way to King's Landing should have been an entire season.
Humanity's last stand against the darkness. Lannister. Baratheon, Stark uniting to defeat a dreadful foe.
Instead defeated by a parlour trick by Arya in a single episode.
Hopefully JMS will take note for his new alternative Shadows ending (if there are Shadows) for Babylon 5 remake.