You complain about the shortage of quests, but you don't even mention how boring and repetitious they are? Between fetch this and that, kill X number of these, gather some of that stuff, talk to every single npc in the most god forsaken parts of the world,tour de eorzea and place this X at Y spot on map and kill Z that spawns... and grinding FATEs? The answer is obvious.
FATEs. Hands down.