We know quite a bit actually. It's not necessary to identify the individuals. Years, regions, tell you a lot.
Not the authors not it's origin
Why is that important? Why do you think we need to know the names and histories of the authors?
For example, here's what we know about Deuteronomy
Traditionally seen as the words of Moses delivered before the conquest of Canaan, a broad consensus of modern scholars see its origin in traditions from Israel (the northern kingdom) brought south to the Kingdom of Judah in the wake of the Assyrian conquest of Aram (8th century BC) and then adapted to a program of nationalist reform in the time of Josiah (late 7th century BC), with the final form of the modern book emerging in the milieu of the return from the Babylonian captivity during the late 6th century BC.[3] Many scholars see the book as reflecting the economic needs and social status of the Levite caste, who are believed to have provided its authors.[4]
Revelation