I think it would suck to be as powerful as he is and too know everything that is going to happen before it does happen. That would suck even to God.
Maybe he wanted something to thrill him-give him a challenge so to speak? Maybe even he wanted to see what would happen if he did not get involved for s***s and giggles...and I am being serious here.
Impossible as to do so would violate his sovereign nature. He doesn’t need to be challenged to be happy. He is a blessed God (happy), fulfilled in Himself. He is not like us but in some ways we are like Him. A perfect God has no needs. He says in scripture, if I were hungry I wouldn’t tell you.
You sure are limiting God, aren’t you. Not to mention leaving no possibility for the existence of a devil who would lie about Him.