It's quite telling that you're using GRRM to shield Dipshit and Dumbfuck from criticism with "but he told them the ending!!1!" (never mind that he told them the ending in broad strokes, and later on clarified that what people know from the show is "an ending but no THE ending", but whatever), but when it comes to criticism like how the show should have taken longer you're desperately trying to hand-wave it away by trying to portray it as "bitterness without merit", you merrily ignore that GRRM himself commented multiple times that the show could have gone on much longer.
What these two morons left as their "legacy" is a dumpster fire that turned a once great show into an utter joke that barely anyone really talks about anymore. To the point that even the recent anniversary of the show didn't manage to make much of a splash in pop culture. The show went fine when they were still carried by GRRM's material, but once they ran out of it their ineptitude could no longer be hidden (though like @
Witchblade77 mentioned, they made pointless changes to the story even before they ran out of the source material and then expected to end in the same spot as the book would because they were too lazy to adjust the story for the consequences of those changes to make sense).
And what came as a result of that? They cut entire storylines that they had no clue what to do with (like Dorne) with the grace of a doctor performing heart surgery with a machete, flip flopped hard on their own premises (one episode scorpions have laser precision even when they are on ships swayed by the waves, the other Dany can burn everything she wants with complete impunity even when faced with much more stable wall-mounted scorpions) and made the most flimsy excuses for their sloppy writing like "Dany kind of forgot about the enemy force she discussed with Varys earlier on in that same episode".
Which, you know, is why their careers are in a ditch right now, despite them rushing GOT so they could jump onto their new Star Wars project. Hollywood finally got wind of how incompetent they are when they are not utterly carried by the source material (given how their greatest achievements before GOT was X-Men Origins: Wolverine - i.e. a complete dreck in terms of writing - for David and sweet fuck all for Dan, it sure took them a while), but right now they are pretty much radioactive in the business.
Though the even bigger joke than the train-wreck they turned the show into is your defense of it. The claim that the later season weren't true to the characters is wholly without merit because the fantastic ending was true to the storyline of all the main characters? Fascinating. You should ping that memo to Jaime "I never cared about the innocents" Lannister. Who never cared about the innocents so neverly he broke his own knightly vows and ruined his reputation to protect the innocents from the Mad King. Or master schemer Varys who turned into a lobotomized caricature of himself and was plotting against Dany right in the open.
Or Littlefinger who, despite viewing Sansa as a mixture of a substitute for Catelyn and the daughter he could have had with her sold her to Ramsay, even when he knew nothing about him. Which GRRM himself stated that it was something Littlefinger would have never done. Oh, right. You only pay attention to GRRM's statements when it's convenient to the defense of the showrunners. I guess I caught D&D-itis and kind of forgot about the exact thing I already discussed in this very
episode post.
And you can miss me with your sad "desperate cries because those people didn't get what they wanted" projection. The only specific want for the ending of GoT that I had was for Daenerys to die. Would you look at that, I got what I wanted. I still think the ending was trash, because I actually have standards.