If you could retcon one thing, what would it be?
It can be anything - anything you think would had driven the story in a better direction (even at the cost of game play)
For me there are a couple:
- Blood Elves should had joined Alliance
- Paladins should had remained Alliance/ Shamans remained Horde
- Sylvanas should had supported Grand Apothecary Putress durign the Battle of Undercity, effectively creating a de facto third mini faction