One person's opinion
The flaw, for me, of "High" fantasy is that one character (a wizard of some kind) can wipe out the massing horde in one "epic" battle...after readers have waited through several books or have been watchers of several seasons before deciding to do what could have been done at the end of book one.
I suppose delayed gratification is powerful for some, but apparently not for me, especially when the wizard fells the horde with a "mighty" swing of the wand or staff. Why wait?
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One person's opinion
@Algot Well I havent seen this season of GoT yet so I cant speak to that.
But LotR was resolved through an epic adventure. Gandalf provided aide but not flick of the wrist solution.
In fact if you read the simerilian you find the exact opposite is true. Gandalf was a sort of god with more than enough power to effect huge change. But in previous forms he was defeated and the use of that power backfired against his cause. Thus why during this battle he appeared as a weak old man with more limited and subtle influence.
One person's opinion
@freemo
I was just informed that after many, many seasons, a single character in "Game of Thrones" defeated the white walkers, the undead horde.
Though I think LOTR has a moment when the wizard defeats the enemy in a similar way.