Why are the works of Shakespeare, Tolkien, and Rowling used to explain away the Book of Mormon, when none of those authors claimed to dictate their work, use their first draft or that their book was true scripture?
It is true that:
Other authors have produced books as long as the Book of Mormon
Other authors have produced books as complex as the Book of Mormon
Other authors have produced books at a similar age to Joseph Smith
Other authors have produced books with the same education as Joseph Smith
Other authors have claimed to write scripture like Joseph Smith
Other authors have used their first draft
Other authors have produced books in a sort a time as the Book of Mormon
Other authors have dictated books like Joseph Smith
However these statements cannot each be viewed in isolation. When viewed all together Joseph Smith is a clear outlier. No other author can be compared to Joseph on all these points.