If These Things are True, Why Does the Bible Not Say So Plainly?

The Bible does not say very much plainly about anything except historical facts. Most doctrinal truth is hidden as treasure for the zealous student to dig and discover.

I can quote a couple of passages on this:

It is the glory of Elohim [God] to conceal a matter;
it is the glory of kings to investigate a matter.
[Proverbs 25: 2, Concordant Literal Version (CLV) ]

And he said unto them, Unto you it is given to know the mystery of the kingdom of God: but unto them that are without, all these things are done in parables:
That seeing they may see, and not perceive; and hearing they may hear, and not understand; lest at any time they should be converted, and their sins should be forgiven them.
[Mark 4:11, 12. (King James Version) ]

And Psalm 1 says:
1Blessed is the man that walketh not in the counsel of the ungodly, nor standeth in the way of sinners, nor sitteth in the seat of the scornful.
2But his delight is in the law of the LORD; and in his law doth he meditate day and night.
3And he shall be like a tree planted by the rivers of water, that bringeth forth his fruit in his season; his leaf also shall not wither; and whatsoever he doeth shall prosper.
4The ungodly are not so: but are like the chaff which the wind driveth away.
5Therefore the ungodly shall not stand in the judgment, nor sinners in the congregation of the righteous.
[Psalm 1:1-5. (KJV) ]

In the three above-quoted Scriptures, we can see that God uses encryption ... in the form of parable in order to hide truth from the wicked and to bless those who dilligently seek Him.

The truths about the purpose of suffering, death, and the prison known as the grave or "hell", have been mysteries to all but the few who dilligently seek to know the Father, the Son, and the Holy Spirit.

I hope that helps satisfy some reader's hunger for a beginning at studying these matters.

--Remedialist