The interesting thing is they tried to make FATEs more appealing in Stormblood by adding that XP buff you can get from beating a particular enemy when it appears (I forget the name of it). I'm the end it didn't really last long because the XP still wasn't worth it that much, and there were other more effective ways to level up. Still the changes in ShB brings a more worthwhile incentive because least you can choose what to trade the currency for and isn't only XP related.