The problem is that the system requirements for running FFXIV smoothly are ridiculous. Most of us already compensated for that by dishing out hundreds of dollars extra to upgrade our PC's, but that's just the problem. FFXIV loses a lot of player base because of the system requirements and inherent FPS lag problems.
Poor optimization and technical problems galore. The rate of application crashes for this game is tremendous, and wide-ranging. A majority of people experience them all of the time.