Why does the author share the details of Joshua’s death and burial?

Joshua was buried in the land of his inheritance in order to demonstrate that the land belonged to him and his descendants as their God-given heritage (see Genesis 49:29–32; Genesis 50:24–25; Joshua 24:32–33). And his epitaph reminds us that faithful service to God is rewarded by God’s rich blessing (often in the form of long life, cf. Genesis 50:22)…. At the same time the notation of Joshua’s death has a foreboding quality about it. The finality of death and burial highlights the fact that an era was quickly coming to an end for Israel.¹