I haven't seen season 7 or 8 yet, but...yeah, I'm invested in the characters, I want to know how it all turns out - but it feels like the last two and frankly four seasons are more bad fanfic than good continuations.
The books had some very clear intentions and general ideas. The show goes almost entirely against those in some cases. Yes, inverting expectations and tropes is part of what made the books famous - but the deaths and plot twists made sense, and while shocking, could be looked back on and understood. It made sense that Ned died - we only might have expected him to live because of our of character reasons - he's the protagonist, etc.
Frankly, after the Walk of Shame, Cersei no longer makes sense as the Queen on the Iron Throne, unless as a stooge for someone else - and that's just an example. Her story/role were played out long ago, and she's still around because she's a fan favorite and a big name. Frankly, of the show wants to salvage something on that front, she simply shouldn't get a battle. Dany had killed/conquered more than enough queens, kings, cities. Ultimatum, dragon, done, next please. Of course that's not what's going to happen.