(Main Spoilers) Worldbuilding just to Impress

What worldbuilding elements do you think GRRM added simply because they seemed epic, but narratively don't work that well?

Example: Long seasons. Winters lasting years are one of the saga's most distinctive elements, but let's face it, the Free Folk would have starved.

Another example could be the height of the Wall, but we know GRRM isn't great with numbers, and in his mind, it might have worked (I'm thinking of the Free Folk launching arrows from the base of the Wall).