This is like you have read my mind. I agree totally with your comments on Flanagan. I can’t forgive what he did to the best opening in horror literature with the ending of Hill House.I haven't watched that one yet. Not to derail the thread, but how much connection does it have to the story? I enjoyed The Haunting of Hill House, but its connections to the source material were tangential at best.
I suppose that's not a trope, per se, but one thing I am tired of is "adaptations" that don't actually adapt the source story. Flanagan did it again with The Haunting of Bly Manor, which was an adaption of Turn of the Screw, except it really wasn't.
The film A Haunting in Venice is another one. It's based on Agatha Christie's novel Hallowe'en Party but bears almost no resemblance except someone dies at the Halloween party.
I'm not saying that makes these films and shows bad. On the contrary, I've actually had a good time with most of them. They just have little to nothing to do with the stories they're adapting, so I'm left wondering what the point is. Tell the story you want to tell. That's fine. But don't borrow another title just for the sake of name recognition, which is how it comes across a lot of times.
Bly Manor I gave up on 3 episodes in.
Usher, however is more compelling and tight; using each story as a loose theme for the episode. The Masque episode (2) was phenomenal and the ending was quite upsetting. Even for a jaded old b**** like me.