I seem to have missed your point about what way are these allegories exceedingly helpful.
They may not be helpful to everyone. However, what is taught by means of symbolism or allegory is accompanied by plain words. It is just that a picture is worth many words.
Even if plain teaching of Christ being the thriving One in limitation or Christ having the resurrection life may not be useful to the fleshy, natural man who doesn't contact Christ or live in the realm of the Spirit of Christ.
Any number of vocal atheists would loudly protest that any teaching about God or the Son of God is not "helpful".
Let me tell you, that is is what idolatry is about and it is condemned in the bible.
The discussion here has nothing to do with idolatry.
The discussion is about "Is there wisdom in some of the things found in what one Witness Lee spoke."
The mention of wheat
having to do with Jesus is suspicious to the atheist Ghost as foolishness.
Witness Lee taught that Christ is the central Person in the whole Bible. And that the Good Land of Canaan, the Promised Land, was too an allegory of Christ WITH all of its riches, natural resources, benefits, and supply.
Now we do know that the Apostle Paul wrote that so many things of the Old Testament were written for lessons and examples to the new testament believers.
"Now these things occurred as examples to us, ..." (1 Cor. 10:6a)
"Now thee things happened to them as an example, and they were written for our admonition, unto whom the ends of the ages have come." (v.11)
We believe what was written about the riches of the Good Land and the land itself, in addition to being history, serves also to be spiritual lessons to the new covenant believers concerning salvation in Jesus Christ.