Answer:
Creating a story is rendered almost impossible without structure. It helps the plot flow and make sense and gives the characters motivation and therefore development. A story can't have a sound end without a well formatted middle! Trying to write beyond normal structure is almost impossible as vague characters attempt to do impossible things with no motive and no reason to succeed. The story, with the format of an average tale such as the Hero's Journey Cycle, creates a well rounded and satisfying plot.
Hope this helps!
