The text in the book of Jarom manifests his careful attempt to explicitly perpetuate the tradition of keeping the record according to Nephi’s command. For example, Jarom, the son of Enos, personally wrote on plates (Jarom 1:1) that were "small" (1:2, 14). He distinguished the plates he wrote on from the "other plates of Nephi" which were written by "the kings, or those which they caused to be written" and which contained the records of "[the Nephite] wars" (1:14).
Jarom wrote "a few words" (Jarom 1:1) and wrote "a little" (1:2) in order to keep "the commandment of [his] father, Enos" (1:1). Specifically, Jarom wrote his record "for the intent of the benefit of [his] brethren the Lamanites" (1:2). He chose not to record "[his] prophesying" nor "[his] revelations" because Jarom felt that there was nothing more he could write than what was already written by his fathers before him (1:2). However, Jarom did make a record of the many prophets, priests, and teachers who taught the people "to look forward unto the Messiah, and believe in him to come as though he already was" (1:11). Jarom ensured the preservation of the Small Plates by delivering "these plates into the hands of [his] son Omni, that they may be kept according to the commandments of [the] fathers" (Jarom 1:15).
The covenant which the Lord made with Enos that the record would survive any Nephite destruction for the benefit of the Lamanites (Enos 1:13, 16) overshadowed Nephi’s and Jacob’s previous stated purpose of the plates—benefiting "our" people. These are subtle and understandable shifts.
John S. Tanner, "Literary Reflections on Jacob and His Descendants," in Jacob Through Words of Mormon: To Learn With Joy, Book of Mormon Symposium Series, Volume 4, ed. Monte S. Nyman and Charles D. Tate, Jr. (Provo, UT: Religious Studies Center, 1990), 251–269.