I said this in the thread on the entertainment board, the Burlington Bar stuff is the embodiment of everything that became wrong with GoT post season 4
It became too popular for its own good. It went from being a show you had to sit down quietly and concentrate to watch, to a show people watched in a f***ing bar to scream and shout like idiots for reaction videos whenever something exciting happened.
Then the writers started focusing all their energy on those big moments and making things look cool, and didn't properly build up to them or make any of it make sense. They just wanted to pander to the lowest common denominators who had started watching the show. Originally the target audience was only meant to be people who were fans of the books and people who like the fantasy genre, they didn't expect it to go so mainstream.
As easy as it is to shit on D and D, it's worth noting how much the show exploded in popularity and the massive expectations that came with it. There was a nearly insurmountable amount of hype.
However, it's as if they stopped caring about the overarching narrative and started focusing too much on fan reactions, which is the exact wrong way to write a show. Yes, you have to consider the audience, but we ultimately want to see the writers' ideas, not the writers crafting the story around what they've seen in online discussions.
That's as lenient as I'll be because the way some of the characters' storylines ended was nothing short of shameful. At least Lost can use the excuse that JJ Abrams is only good at writing an intriguing premise, because Game of Thrones conceivably could have delivered up until the end, but D and D wanted to move on to future endeavors.
It was the culmination of many concurrent issues. No more source material, too much hype, showrunners that want out, bad writing, too much fan influence, and I'm sure there's more.