Authors often choose a linear plot structure primarily because it is usually clearer for readers to follow. A linear structure presents events in chronological order, making it easier for readers to understand the sequence of actions and the evolution of the plot and characters. This clarity can enhance the reader's engagement and emotional investment in the story.
While a linear plot can also provide depth and detail, and it might take less time to compose due to its straightforward nature, the primary reason tends to be the ease of comprehension for the audience. Nonlinear structures can be creatively rewarding but might require more effort from readers to piece the story together.