Why are there differences in how the Bible's writers expressed God's message?

Jodie 44, A wonder full answer.
If I may. A little about Job and the writer;
*** si pp. 95-96 pars. 4-6 Bible Book Number 18—Job ***
4 Job lived in Uz, located, according to some geographers, in northern Arabia near the land occupied by the Edomites and east of the land promised to Abraham’s offspring. The Sabeans were on the south, the Chaldeans on the east. (1:1, 3, 15, 17) The time of Job’s trial was long after Abraham’s day. It was at a time when there was “no one like [Job] in the earth, a man blameless and upright.” (1:8) This appears to be the period between the death of Joseph (1657 B.C.E.), a man of outstanding faith, and the time that Moses entered upon his course of integrity. Job excelled in pure worship at this period of Israel’s contamination by the demon worship of Egypt. Furthermore, the practices mentioned in the first chapter of Job, and God’s acceptance of Job as a true worshiper, point to patriarchal times rather than to the later period from 1513 B.C.E. on, when God dealt exclusively with Israel under the Law. (Amos 3:2; Eph. 2:12) Thus, allowing for Job’s long life, it appears that the book covers a period between 1657 B.C.E. and 1473 B.C.E., the year of Moses’ death; the book was completed by Moses sometime after Job’s death and while the Israelites were in the wilderness.—Job 1:8; 42:16, 17.
5 Why do we say Moses was the writer? This is according to the oldest tradition, among both Jewish and early Christian scholars. The vigorous authentic style of Hebrew poetry used in the book of Job makes it evident that it was an original composition in Hebrew, the language of Moses. It could not have been a translation from another language such as Arabic. Also, the portions in prose bear stronger resemblance to the Pentateuch than to any other writings in the Bible. The writer must have been an Israelite, as Moses was, because the Jews “were entrusted with the sacred pronouncements of God.” (Rom. 3:1, 2) After he had reached maturity, Moses spent 40 years in Midian, not far from Uz, where he could obtain the detailed information recorded in Job. Later, when he passed near Job’s homeland during Israel’s 40-year wilderness journey, Moses could learn of and record the concluding details in the book.
6 According to The New Encyclopædia Britannica, the book of Job often is “counted among the masterpieces of world literature.” However, the book is much more than a literary masterpiece. Job is outstanding among the books of the Bible in exalting Jehovah’s power, justice, wisdom, and love. It reveals most clearly the primary issue before the universe. It illuminates much that is said in other books of the Bible, especially Genesis, Exodus, Ecclesiastes, Luke, Romans, and Revelation. (Compare Job 1:6-12; 2:1-7 with Genesis 3:15; Exodus 9:16; Luke 22:31, 32; Romans 9:16-19 and Revelation 12:9; also Job 1:21; 24:15; 21:23-26; 28:28 respectively with Ecclesiastes 5:15; 8:11; 9:2, 3; 12:13.) It provides the answers to many of life’s questions. It is certainly an integral part of the inspired Word of God, to which it contributes much in the way of beneficial understanding.
Regards Larry