A lot of GRRRRRRRRRRRRRR's writing is eddies and dead ends. He spent 12,000 pages on Stannis -- for what?
To share the experiences of the people living in his fantasy world. To build up the hope and tension to the levels of stannis himself, and of his followers. The first person style is meant also to accomplish this. He wants the reader to feel the same letdown and hopelessness, when the best laid plans go awry. 12000 pages versus 12 accomplishes this.
The problem is that when a writer does that, they often write themselves into a corner that they can't get out of in a believable way. I specifically mentioned Orsen Wells in the OP for that very reason. In the War of the Worlds, he spent the entire novel building the Martians up to such a level that only God, in his infinite wisdom, could beat them. Poor storytelling.