From secular Yale professor Christine Hayes’ Introduction to the Bible:
The Garden of Eden story contains a narrative feature that will recur in the Pentateuch: Yahweh’s recalibrations in the light of human activity. Following the creation, Yahweh has to punt a bit. He modifies his plans for the first couple— barring access to the tree of life in response to their unforeseen disobedience. Despite their new mortality, humans are nevertheless a force to be reckoned with— unpredictable to the very god who created them.
Hayes, Christine (2012-10-30). Introduction to the Bible (The Open Yale Courses Series) (Kindle Locations 958-961). Yale University Press. Kindle Edition.
Why unpredictable? Their heart is evil from their youth on? :-)