Oh god where to start.
You didn't catch anything I said. Those characters mentioned, I said that they still have a chance to include. What I find perplexing is that Coldhands could have been included and used for the mutineer's episodes. Showing through the eyes of Summer as Bran warged into her, Coldhands killing the mutineers. One, saving money on extras and having Locke bullet train to The Wall undetected. Two, not having another, "oh my god will they or won't they" Stark reunion. Three, burning down a set that could have been easily refurbished. Four, if using Coldhands in this way a lot of filming from Craster's would not have been necessary. Five, the audience gets a better understanding what Bran is going into.
what at all has he done in the books? Nothing of import.
Except kill mutineers and establish that magics are on the other side of The Wall. As well as showing the magic of The Wall. (The scene where Sam takes Bran to meet Coldhands.) Also, we don't know how important Coldhands is because we haven't seen enough of him in the books. But with what he have seen from him, which has been the protection of main characters, most importantly Bran, there is a chance he has more to play.
I have really liked the job they have done with Arya. The changes they made with Arya and Tywinn really made Tywinn a more prominenet character and his interplay with Massie was remarkable. Good stuff. Them changing the way Arya loses herself and killing the tickler at the inn was disappointing but they sort of redeemed that by her killing along the road.
Yeah, will you point out to me where I said they did anything wrong with Arya? Her changes are fine, other than going to the Eyrie and suddenly being like, "eh, frick it, my aunt is dead." Which also adds to another "will they or won't they" Stark reunion.
The list that I made of each character was about their transitions from what they used to be into an all new self during AFfC and ADwD. It was my pseudo-explanation of the theme of those two books. It's why I started the list by pointing out that the Westeros and Essos are both changing along with the shift in the seasons.
All this being said, I'm still going to watch the show and enjoy it, but that doesn't mean I have to accept David and Dan's interpretation as the best that could be done going forward.