Originally Posted by
Magis
The journey is what gives satisfaction and meaning to the reward, but the reward is the carrot on the stick. If only the journey is the only thing that is important, then where is your Savage Coil clears? Oh wait, there is no carrot there, so there is no reason to do them! This is why those instances failed, not their difficulty, but a lack of reward for said trials. Putting a story mode would basically do the exact same thing. You can't build a good raid without both the trial to put some meaning behind what your getting, and the reward itself to act as that driving force to push through the content. Otherwise you either have unsatisfactory content (see dungeons) or no motivation to do said content (see savage, Ramuh pre-buff).