Early on, I settled on the first-person strategy as a way to...

Early on, I settled on the first-person strategy as a way to deal with exposition and world-description issues. As long as the book is, it could have been far longer had I gone with an omniscient third-person narrator, or multiple point-of-view characters, since either of those would have enabled me to impart much more detailed information about the history and geography of the world.