FFXIV is doing a lot of things right that WoW misses the mark on. The inverse is also true. The difference is, FFXIV developers are willing to learn the lessons that their competitors are teaching them, whereas WoW is mired in its own past.
Blizzard used to be known to taking the best practices in their genre of choice, consolidating them, perfecting them, and launching games that are the pinnacle of their genre for years. Now? They've stopped looking externally. They've stopped trying to innovate almost entirely. And it's precisely because they share the attitude you're espousing here: "It wasn't my idea, therefore, it's a bad idea."
They spent so long at the top that they forgot how they got there in the first place.