It is because with a chronological or linear structure, the reader finds out what happens in the 'correct' order - this can lead the reader through events clearly. You could use a non-linear structure where flashbacks show the reader a past event, gradually revealing details that have an impact on the plot.
For example, in Toy Story we follow Woody and Buzz's adventure in a linear order, starting at the beginning and ending with the conclusion of the story.
