A very well-argued piece, that I happen to disagree with. You are absolutely right about the helpless cog in a machine, Greek tragedy aspect. However, to me that makes the film unsatisfying. I think it is superbly acted and directed, but after a brilliant first act, which promises psychological horror, the film can't decide whether it wants to be a ghost story, or a satanic panic tale, and somewhere along the line I stopped caring about the characters. The other reason I ceased to care (and to the main point of your article) is that when a character cannot choose their fate, it becomes harder to care. To my mind, the most satisfying and compelling horror stories with bleak finales are those where the protagonists either deliberately make foolish choices (out of selfishness or being deceived, or both) or if they deliberately choose evil. I expressed these arguments far more eloquently in my original review of this film. :)
All that said, I loved Ari Aster's second film, Midsommar. To my mind, that was a lot more satisfying.