In the second case anyone but the registered owner, who carries a valid license is free to drive as long as the car is insured and registered and where applicable, inpsected.
Get license back at 10 am. Car gets spotted in parking lot at 10:20. Car gets towed/ticketed. Entered into system. Now anyone who has ever had any foul up in the police/legal (no justice, but legal) systems knows they are in for a world of hurts unless you are the guilty party.
I do think it is a great idea and will help the cops out a lot. But for us bad luck attracters - our pain threshold has just quantum leaped.
"Oh sorry asswipe, yes your expired license was reistated 5 years ago - just never got updated. Sorry but your car was impounded and sold... yes all within 5 minutes."