Free will tends to be a subject treated as a sort of sacred cow that none dare look at disparagingly.
Isaiah 55:9 tells us, "For as the heavens are higher than the earth, so are my ways higher than your ways, and my thoughts than your thoughts." So what would naturally seem to us to be a subject that we should esteem and cherish (like our option to choose), God more than likely has different thoughts than ours about it.
I propose that God offered free will choice to the originally sinless couple, simply to give an eternal display that any created being (whether angelic or human), when offered the option of choice, unless supernaturally upheld and enabled by God, will eventually and inevitably succumb to making a choice for evil, thus resulting in death and separation from God's perfection. Only God the Creator Himself can be trusted with this dangerous power of free will; One who can be counted on to NEVER default into making an evil choice with that power.
Free will handed to fallen creatures is a double-edged sword that we wield to our own destruction. It would seem that heaven, as the final purified state for us, will include the removal of all impulses to choose anything other than God's perfect will. Anything less than being totally submerged in God's will would be to live precariously at risk for another fall into sin. To be thus exposed to the possibility of another fall would not be a restful state to remain in for all eternity.
Humanity has devised pejorative terms for such a perfected state; terms such as "mindless robot", "slave", "the Borg mentality", etc.. Christ Himself was not averse to claiming total subjection to the Father's will, saying "I do always those things that please him", and "Not my will, but thine be done". Yet we do not despise Christ for voicing this total merging of His own will with that of the Father. Why should this be something repugnant when it comes to the idea of our having free will stripped from us in the final perfected state?
