The gathering and crafting system. After finally getting all my battle jobs to max and starting on my crafting and gathering jobs, I can see why a lot of people view FFXIV's "Profession" system as one of the best. I don't think i've ever enjoyed and been immersed this much into crafting and gathering in any other game as i am in FFXIV. I can't wait for the new crafter's endgame content they have in store for Shadowbringers.