Even accepting the Night King as so simple-minded leaves plenty of completely unexplained questions. Why did the NK have such an interest in gory, large-scale art installations? Something that was seemingly so significant that it was featured three different times, including in the series premiere and the season premiere and yet was apparently ultimately meaningless? Why did the NK decide that NOW was the time to march south after waiting thousands of years? Accepting Bran’s explanation for why the NK wants to kill Bran, what’s the rush? If he is always able to find Bran, why not stand back and let his wights kill literally everybody else before tracking down Bran? He doesn’t even have his wights take out Theon first? Just because he wants to risk it all in order to flex on Theon? The NK being immune to everything but dragon glass, having been created by dragon glass, makes some sense. But why can he also be killed by Valyrian steel? He’s immune to the fire of Valyrian dragons so it’s not simply some Valyrian magic shit.