Why isn't life after death discussed throughly in the Torah? Part 8 of 8

Hi,

"When Gd wished to give the Torah to humanity, to publicize His mitzvot and His religious laws and prohibitions via His prophets throughout the world, as in (Shemot 9:16), 'In order to tell of My Name in all the land.' He created great signs, which are recorded throughout the Torah, until these caused people to believe in the prophecies of the prophets and the creation of the world… 

"And He did not transport them from matters of this world, with reward and punishment. And he continued thus until these cornerstones were strengthened and held as true for the flow of generations, and no doubt remained in the prophecies of the prophets and the creation of signs. And then the prophets told us that which Gd had told them, of resurrection of the dead, for [then] it was easy to accept this."

(Rambam, Maamar Techiyat haMeitim (Statement on the Resurrection of the Dead))

Have a great day,
Mordechai