“I have no clue how Game of Thrones was so well written in the current Hollywood climate.”
Because all the good seasons were based on the books. Once they ran out of books and hired Hollywood writers to finish the story, the quality dropped off dramatically.
(Ironically though, the author of the books started out as a Hollywood writer himself, so go figure.)
Their mistake was switching from the detail-oriented, logical “sociological” storytelling method to soap-opera style “psychological” storytelling.