Lack of End Game Content

[Nixxe]

you have to evolve with the world.

10 hours is a quarter of a fulltime job. if 15 hours is still MEGA casual, that's a problem in definition. if someone told you they went to the gym 2 hours a day, 7 days a week, you wouldn't say they are a mega casual gymgoer.

i would say 15 hours is above the median for FFXIV subscribers.

Because that's substantially more time than the average person needs for an appropriate weekly workout routine. It's not really an apt comparison to a video game, which is purely for recreation. If someone told you they spent a few hours a night on any other hobby, you probably wouldn't bat an eye at it, though you might be envious of their free time.