In fact, the very observation that gave rise to this false doctrine still is a valid one. When people die here on earth that are safe to save in God's eyes, they do so in widely varying stages of knowledge and trust in God. I think nearly all would agree that most, if not all, who will be saved do not have a very clear understanding of the true nature of the Great War and barely have an appreciation for simple Salvation and the nature of God.
Given the fact, though little promoted, that God operates totally absent of force against free will, He will not suddenly suspend that principle of His nature for His convenience when we arrive in heaven after the Second Coming of Christ. He will no suddenly impart to us perfect characters and instantly empty our minds of all false ideas, pain and unresolved troubling memories. His overwhelming value for , and insistence on freedom for our will to induce us to love Him precludes this possibility.
It is very much like the operation of an electrical transformer. Two coils of wires are in close proximity to each other but must not touch each other for the transformer to properly operate. One coil of wires has high voltage passing through it while the other is completely devoid of power except as induced by the field effect induced by the first coil. This explains why sinful humans cannot see God's face without suffering death; it would be like touching the wires inside a transformer together.
In fact, this illustration fits quite well to this very issue. The more distant the two coils, the weaker the healing energy is transferred. Since there is an obvious need for much healing and resolution in the hearts of the saved and chosen when they get to heaven, there is great need to move their coils into closer proximity to the presence of God the Father to transfer much more grace and healing love into their hearts to effect a full restoration of His image in them in preparation for the final climatic Revealing.
This is what the millenium is all about. God is assembling all the “coils” who have accepted His offer and provision for them, to be with Him and the angels for a thousand-year healing service of worship, praise and reconciliation in very close proximity to the center of all power. Hence the need for the healing leaves of the Tree of Life and all the other arrangements for bonding, growing, maturing etc.
When all the “coils” are finally interconnected and fully united in one mind and spirit, Christ's body will be then ready for the final act that will stun the whole universe with awe and wonder. His body after one thousand years of growing into oneness, synchronizing with the heart of the Father, tuning up their instruments under the orchestration of Jesus Himself, will be ready at last to make a direct connection to the power source with no more need of an intervening transformer.
The introduction of sin created a fatal weakness in all created beings infected by it that necessitated the whole arrangement of a step-down transformer if they were to continue to exist. The whole history of sin and Salvation is God's immensely complex wisdom to restore as last the whole universe to operating at full power again without discarding any offending elements if they are willing to accept His authority and rewiring arrangements for them.
Jesus was publicly crushed into a coil by becoming a human so that the power flowing through Him could be created in us if we will live close enough to Him. The closer we come to Him the more life-giving power is induced in our coils to flow through our circuits.
Transformers work on Alternating Current – AC – rhythms of power. DC – Direct Current – does not induce power. Transformers synchronize the rhythms between both circuits. The Father might be planning a last to switch us over to DC which is much more powerful than AC. The wicked insist on keeping faulty AC wiring and cannot handle the exposure to the overwhelming DC at last.