Do you seriously think that God would inspire them to write books of the Bible, and then fail to guarantee providentially that their works be preserved and included into the official canon? If you really think so, then we would be talking about at least 7 hypothetical Biblical authors whose writings didn't make it to the canon: Philip, Philip's four daughters, Barnabas and Agabus.
Why would God allow their contributions to the canon to be lost, according to your theory?
The first of three letters to the Corinthians and the letter to the Laodiceans were mentioned in the Bible and lost. It would be great to have recordings of the many preachings of Peter and Paul, James, John, Apollos and Timothy.
Also there was Mary sitting well at Jesus feet listening and learning, from the point of view of a repentant sinner, not forgetting Mary Jesus' mother. Their insights would have been a great contribution. I suspect any such writing was read to pieces and not lost because of disinterest.
The concept of "the Bible" is a work of men, after intense persecution. The ancient people did not have the press and good storage of information. If we look at Peter and Paul, they died under persecution maybe more than ten years before their natural lives' ends. Under these circumstances, Bible works were lost, with the authors.
Paul the apostle hadn't finished his works, but he described himself as having done the works of running the race, this is not to say he had finished a complete set of tasks for his life and was simply ready to die. Paul had not preached to the Roman Garrison... The Emperor was insane and wouldn't listen. He demanded worship. Centuries later Aquinas had to fill in works regarding Christian soldiers. I haven't read this work though.
Colossians 4:17-17. KJV
16And when this epistle is read among you, cause that it be read also in the church of the Laodiceans; and that ye likewise read the
epistle from Laodicea.
17And say to Archippus, Take heed to the ministry which thou hast received in the Lord, that thou fulfil it.