crazyguy,
I see several reasons for the OT writings.
Firstly, the general populace were not only illiterate, but they would have had no contact with the Temple or with the scribes. So I see one set of Scribes writing their accounts as propaganda against the others, notably the Elohist against the Yahwist (and vice versa), that is the Aaronides against the non-Aaronides, that is the Northerners against the Southerners (read and enjoy "Who Wrote the Bible?", by Richard Elliott Friedman).
These writings are religious histories, not literal histories as we would know them. Their ideologies determined the narrative. That applies also to the NT Gospels. They were written in order to influence and to manage their own immediate communities. The Deuteronomic History is a prime example. Another example are the symbolisms employed in the Creation Myths, especially the story that begins at Gen 2:4B.
Each of these writings was addressed to its own immediate community, not to any future generation. They most certainly were not contemplating that they were writing to people living thousands of years later.
I also see these writings as a means to give these two very minor nations (Judah being the minor party) a sense of self-importance, of endeavouring to provide themselves with an identity while existing in the shadow of really powerful nations.
Doug