From A History of Iran: Empire of the Mind, by Michael Axworthy (Basic Books, 2016), Kindle Loc. 662-70:
Who were the Macedonians? Some have speculated that they were not really Greeks, but more closely related to the Thracians. Or perhaps they descended from some other Balkan people influenced by the arrival of Indo-European Greeks. They had come under heavy Greek influence by the time of Philip and Alexander—but even at that late stage the Macedonians made a strong distinction between themselves and the Greek hangers-on who accompanied Alexander’s eastern adventure. In the fifth century BC, Macedonians were normally, like other non-Greeks, excluded from the Olympic games. But the Persians seem to have referred to them as “Greeks with hats” (they were known for their wide-brimmed hats), and Herodotus too seems to have accepted them as of Greek origin. Like the Medes and Persians in the time of Cyrus, as well as many other militant peoples from mountainous or marginal areas, the Macedonians had a strong sense of their collective superiority—but they also sustained many private feuds among themselves. They were notoriously difficult to manage.
From A History of Iran: Empire of the Mind, by Michael Axworthy (Basic Books, 2016), Kindle Loc. 574-94:
Although Darius established a standard gold coinage, and some payments were made in silver, much of the system operated by payments in kind. These were assessed, allocated, and receipted from the center. State officials and servants were paid in fixed quantities of wine, grain, or animals; but even members of the royal family received payments in the same way. Officials in Persepolis gave orders for the levying of taxes in kind in other locations, and then gave orders for payments in kind to be made from the proceeds in the same locations. Couriers were given tablets to produce at post stations along the royal highways, so they could get food and lodging for themselves and their animals. These tablets recording payments in kind cover only a relatively limited period, from 509 to 494 BC. There are several thousand of them, and it has been estimated that they cover supplies to more than fifteen thousand different people in more than one hundred different places.
It is significant that the tablets were written mainly in Elamite, not in Persian. We know from other sources that the main language of administration in the empire was neither Persian nor Elamite, but Aramaic, the Semitic lingua franca of Mesopotamia, Syria, and Palestine. The Bisitun inscription states directly that the form of written Persian used there was new, developed at Darius’s own orders for that specific purpose. It is possible that he and the other Achaemenid kings discouraged any record of events other than their own monumental inscriptions, but these are all strong echoes of the Iranian distaste for writing that we encountered earlier in Mazdaism, and it may go some way to explain an apparent anomaly—the lack of Persian historical writing for the Achaemenid period. It is possible that histories were recorded, that poems were written down, and that all sorts of other literature once existed and have since been simply lost. But later Persian literary culture was strongly associated with a class of scribes, and the fact that the scribes in the Achaemenid system wrote their accounts and official records in other languages suggests that the literature was not there, either. There was no Persian history of the Achaemenid Empire because the Persian ruling classes either (the Magi) regarded writing as wicked or (the kings and nobles) associated writing with inferior peoples—or both. To ride, to shoot the bow, to tell the truth—but not to write it.
That said, no histories as such have survived from the Egyptian, Hittite, or Assyrian empires, either. It is more correct, in the context of the fifth century BC, to call the innovation of history writing by the Greeks an anomaly.