Because as someone who is currently forced to do the MSQ(See on the left I am Lv52, thats my main) it is making me respect the game, the whole dev team has the story writers respect too and I feel immersed and like I am genuinely playing an RPG not a WoW clone where non-RPG fans teleport to all the content and rarely speak.
Jumping potions I would likely not use but then feel bad either way, like if I used them I will feel like I am missing content, if I didnt I would feel I am wasting time, it creates a dilemna.
It also brings in a different crowd of people, you know.. I am not talking casuals thats fine but the whiney type who want things easy and should probably be playing a different genre as they cant appreciate a sense of achievement due to being time constrained.