Textual scholars believe that these books were not written by their named authors.
Other things being equal, textual scholars expect that a larger time gap between an original and a manuscript means more changes in the text.
For hundreds of years, biblical and textual scholars have examined the manuscripts extensively.
Since I'm not a textual scholar, I don't know the details.
Therefore, some textual scholars regard its presence in the Masoretic text as a later editorial gloss.
Some textual scholars view this as a postdiction - maintaining that the poem was written long after the tribe had settled there.
Gilead was a tribal group mentioned in Biblical passages which textual scholars attribute to early sources.
Some textual scholars suspect that the name of the altar must have been dropped by a copyist, either deliberately or unintentionally.
Textual scholars suggest that these two roles come from different sources, which later were spliced together to form the Book(s) of Samuel.
Among those who condemned the book were the ecclesiastical textual scholar, Nicholas of Lyra.