Oral tradition only talks about it because the concept was assimilated from foreigners, probably to keep Judaism "competitive" with foreign religions.
There is no longer a need for this false advertising, because many people no longer believe in an after-life.
It's a false hope, or at least something that can't be proven.
If there was a reward or hope of after-life, it would have been mentioned in the written Torah (if you don't like that term, which I use to differentiate a clearly DIFFERENT body of literature from the Oral Torah, then call it the Pentateuch, if you wish).
What IS mentioned OFTEN in the Tanakh, but RARELY talked about in the Oral tradition or modern Judaism, from what I've observed, is SHEOL.
What is sheol? It's where you are DEAD.
Apologies, but that's the TRUTH of the Tanakh. Believe what you want, but the evidence is on MY side of the argument.