Why is it that the Spirit World so mysterious to us?

We all have visions of what the spirit world is like.
Our own visions of what to expect.
But on the whole what are the basics of spirit and their world?
Why is the truth of the spirit world so mysterious?
Why aren't we given the whole truth of what to expect when our time comes?
We hear this version and that version,most very different from the other.
We know there are different planes starting from the bottom progressing to the most elusive plane of all where we are one with the Great Spirit.
I find this very confusing.

Why can't spirit give us the true picture before we pass onto into their world?
Deepsea