Once we’re persuaded that it is good for us to train our children in obedience, a new set of potholes form in the road, some deeper than others.
There are many ways we get things wrong. Our sin mangles and makes further obedience more complicated. But the complications don’t nullify the command. The exceptions don’t change what God has made plain for all of us. The fact that there are potholes don’t mean we should give up on the road. It just means being alert, swerving, repairing, and occasionally dealing with the erosion that is undermining the road.