The narrative of the Book of Mormon is personal and identifiable- for any journey of a family or people. The " I", rather then "This" is expressive in the scripture, leading the way for us to ever follow.
If you read Exodus, and place "I" to the story of Moses, or even Joseph-has a deliverance, hopeful and directive narrative to help us, then that happened to them- making it distant or even probable. The "I" gives it an intimate, heart filled power because"I" have been there and done that lived it.