In terms of Endwalker's plot, the point to me where it went from alright to my least favorite story this game has ever told was the 2nd half. Specifically everything about the Final Days.
The big hyped up world ending event that absolutely destroyed Amarout and the rest of the ancients. I was looking forward to see how that would change the world, how each city would deal with it, theres a lot of potential for something like this.

What did we get? Red Sin Eaters that only attacked Elephants in India for like 2 days. Sure we had the role quests, but those were basically episodic mini-stories where we saw everyone we ever met was just fine actually, and only newly made npcs could be turned into Red Sin Eaters, everyone else was just fine. The only character across the entire journey we had across all expansions, the only one who struggles with potentially becoming a Red Sin Eater is Fordola, and its not like that even happens, and its not even part of the main story even, just some side quest for materia.

No one was affected by this in side stories in any lasting way, Only NEW characters were affected in the MSQ. It was insanely toothless and felt fake to me.

The Final Days really should have been called "The temporary inconvenience of elephant people"