I'm a fan of LotR and Hobbit, but really don't know much canon from the 1st or 2nd ages. I guess that helps!
To a degree. But a lot of the problems, especially in this episode, have nothing to do with fidelity to the books, it's just bad writing. TV writing, at least on these corporate cash-grab shows, like Disney+ doing the MCU or Star Wars, and Amazon's adaptations seeking the next Game of Thrones, sticking with the source material can cover a multitude of sins, because a writer of proven competence did the world-building, established the characters and plotted the story. When the writers cut loose of the established story, we learn what they are made of, and in the case of this show, as with so many others, they have been found wanting.
“Tolerance is the virtue of the man without convictions.” GK Chesteron
Inde muagdhe Aes Sedai misain ye!
Deus Vult!
*MySmiley*