God's law requires more than we are able. End of story. That is why grace requires nothing.God's law requires 100% of our ability not 101%. Only 101% or greater would be more than we are able to do. We are able to obey God's law by definition because it requires 100% of our ability. "All of your strength" not "more than all" like you are saying.
A concrete "no one ... would ever" is contrary to free will. If any man has free will then he has the power to do those things he "would never" do. There is no metaphysical "would not" without a metaphysical "could not". Knowledge can't turn out more than one way, but free choice can. It's mutually exclusive.