Here is how it was explained to me:
Edenic Satanic Accusations
Mankind and all other creatures made in God's image can do better alone by choosing what is evil or good for themselves. God only reserves that right for himself because he is selfish and not because lack of his guidance would harm his creatures.
God is a liar when he tells us that we die if we sin.
Satan, could do a far better job than God because his views of total freedom from God's rule is best.
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God's Decision:
God's Decision was to allow the challenge to proceed. True, he could have destroyed the rebels immediately. However, destroying Satan and the human rebels would only have proven superior power and left the issue unresolved before all observers. So time is being allowed for mankind to reach the zenith of its scientific progress in order to conclusively show that the claim is entirely bogus. That avoids the accusation that God selfishly and cunningly truncated mankind's efforts just as they were beginning to get things right or perhaps even on the verge of proving that they too could attain immortality without God and thus proving Satan right and God wrong. Once this issue is settled and a legal precedent is be established, then any other rebellions can be immediately terminated whenever or wherever it arises.
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Satanic Accusation #2
A perfected mankind would only serve God if God provided abundant blessings. Otherwise humans would abandon him and curse him to his face. Evidence? Adam and Eve's rebellion over a small deprivation was all that was needed. A rebuttal was provided in Jesus who blessed God and remained faithful despite all the tribulation he suffered
The issue illustrated in the book of Job where Satan question's the sincerity of Job's devotion by tagging it as selfish. Job also provide a rebuttal by showing that even imperfect fallen man is capable of maintaining integrity under extremely harsh conditions and that devotion to God need not be based on selfishness.
So time is also allowed for these rebuttals from God's creatures made in his image to be provided in abundance so that the issue is settled beyond any doubt.
Once these are settled then the end will come.
Why God Permits Evil
https://www.jw.org/en/publications/magazines/g201012/god-get-rid-of-devil/