Why might a historian question the reliability of the rig veda as a historical document?

A historian might question the reliability of the Rig Veda as a historical document due to its origins in oral tradition, which can lead to alterations and embellishments over time. Additionally, the text is primarily a collection of hymns and religious poetry rather than a straightforward historical account, making it difficult to extract factual information. Furthermore, the lack of concrete archaeological evidence to corroborate the events and figures described in the Rig Veda raises further doubts about its historical accuracy.