Animosity with World of warcraft players who still like the game?

[Izscha]

Absolutely this. There's a good combination of people who think this game is either flawless and needs no change or would become super deflective about talking about improvements especially if it came from the other successful game.
Both games could learn from each other. 'should' learn from each other but that would require people stop fighting over which game is better or worse then the other.

There would be no FF XIV without WoW, and still to this day devs will always look at what others do no matter what the community do think about those games.