People who trust that the Hebrew-Aramaic Scriptures as well as the Christian Greek Scriptures are the collection of information that Jehovah wants to give to mankind, might wonder WHY it was not Jehovah's will to inspire by his holy spirit any other scripture in this period .
Had he disapproved of the Jews ever since?
The stage was being created for a major change. Humans had been expelled from paradise, to an imperfect world, due to Satan having so much influence over them. God put Satan in charge of the humans after the fall. God was like the chairman of the Board, with Satan his CEO in charge of the humans.
Jesus said that nobody has seen the Father except the Son. If this was true, What was assumed to be the Father in the Old Testament, was not the Father, but Satan, who was placed in charge as an agent and CEO, who reported to the Father; Book of Job.
Satan, like law and knowledge of good and evil was also both good and evil. The Father is above this division and was still resting after the six days of creation. Since humans chose this division of reality and Satan, he was made Lord of the Earth. God gave the humans a king they would obey. Just before the time of Jesus, the stage was being set for a changing of the guard, via the Son, who knew God, since he had access to the Father; family.
The doctrine of faith was different from doctrine of the law that came from Satan. It was more like the instincts that Adam and Eve had before the Fall. There was no need to be taught, law, since this was innate or supplied from within; DNA and internal instinctive data processes in 3-D.
In Revelations, Satan is thrown from heaven. Satan was condoned in heaven up to this point and was part of God's plan in the OT, and most of the drama of the NT. But after Satan loses his divine authority from God, and is expelled, he continues to exist, but under his own power. This is why there are no consensus compilation of the third or the Newest Testament. Satan ruled, law was created, even false prophets appear, but Satan lost his divine connection. We do not have a third Testament for the past 2000 years, since Satan and law did not come from the highest level of authority. The Holy Spirit offered some clarity, but those of faith were usually under the thumb of Satan and Law. There is no compilation, yet, since it is still not clear to anyone what is just from the Holy Spirit and what is contaminated by the renegade Satan acting as God but lacking divine authority. The Old and New Testament still strikes a nostalgia of when he was God's mediator.