Think of 14 like a long, long, long movie, and you are the lead actor.
And that movie, when you decide to pause it, has some MMO elements.
You can say 14 is more like an RPGMMO than an MMORPG.

If you are craving the mindless grinds, the power scales, the senseless leveling, the meaningless hard battles - it is available on 14 but not as hard as those of any old school Korean MMOs.

It's largely a JRPG before it's an MMO. That's why it is massively, massively popular.