Why is time the only factor here?
Taco and the Wurm.
(Or to expand for those that will miss the point:
The game lacks ways through which players would be able to showcase their skill, so we adopted a universal showcase of skill: time. It's not perfect, but it exists outside of the game and can be applied to the game, making it viable as a means of showcasing skill.
And then, instead of increasing the complexity of the game to allow other measurements of skill, A.Net resorted to using "time" also. The game's most hardcore content is hardcore because of a SINGLE reason: it has a timer. A.Net is currently designing a game where "time" separates the good from the bad.)