No growth, no learning, no real experience no real feeling???!!!! Are you seriously saying that being with God is equal to being stagnant and that learning to sin is really living??!! And who says no one was allowed to leave? They could go anywhere in the universe!!! If you can not see the twisted, backwards, Satanic theory behind that you are truly in a bubble wrap cage of JS theology.
God is love in that He provided a way for us to come back to His perfect world without sin or death by the shedding of His Son's blood.
Rom_6:23 For the wages of sin is death; but the gift of God is eternal life through Jesus Christ our Lord.
You sin you die---period. That is what sin brought. We do not have to thank God for Satan's luring us into sin in order to experience the blessings of real feelings. It is God that provides a way for us to be free from the lies of Satan that sin is real living and feelings!! Real feelings are love, down here real feelings are lust, power, greed, covetousness, greed and violence. If you think those are what real feelings and real life are all about, you will indeed find life in the presence of God stifling stagnant and be most unhappy.
It is not us that pre-existed. All God's angels were created by Jesus--including Lucifer long before us. Lucifer lured 1/3 of the angels away from God with that line of thinking. Yes--God is love--that is real. But at least 2/3 of the angels were smart enough to not believe the lie of Lucifer and preferred the stagnant life that God provided. So do I. This theology is definitely not biblical nor of God.
(And no, there is no verse that says 1/3 of the angels were thrown out--it comes from combining Hebrews 12:12 and Rev 12:3-9)