What happens to consciousness when we die?
In one sense, finding out what is the truth is to pass and see what happens or not. However, if the truth is supposed to relate to our responses while we live, those expectations are not just preferences but frames for our decisions and experience. As a result, they lead to different experiences of what is needed or not. An operating manual for ethical decisions.
It is difficult to approach the question because any view that connects life and death is not replaceable by some principle that keeps them separate. If it was that easy, we would just do that.
Edit to add:
As an example, consider Nietzsche presenting the idea of Eternal Recurrence as the the antithesis to the Christian view that there are two worlds we inhabit at the same time. If there is only one world, then we should adjust our expectations. That Nietzsche still uses the eternal reference is odd.
What is he trying to say?