People will abuse it and make lame excuses for not moving their car.
Keep it simple and move the car as soon as its done charging. No exceptions needed.
I consider myself old, fat, slow, and out of shape... But I'm still in vastly better condition than most people my age, or older, and many people who are younger than I am. It astounds me the minimal amount of physical effort it takes to make most people start breathing hard.
So, in situations where Superchargers are not so conveniently located, for a lot of people the trek across a parking lot in one direction, let alone both, is the functional equivalent of a marathon. I don't know anyone who can run two marathons a day. So, yeah... they are
'lame'. You make the trek from the Supercharger to the Wendy's, Golden Corral, Arby's, or Carl's Jr and you arrive there TIRED. You place an order and sit down. It just may take a while to catch your breath, then convince your body to take that long, hard trail again.
Heck, I know people who need around 15 minutes to cross 100 yards on their own power. I know people who have not covered 100 yards under their own power at once at any time during their adult lives. So asking those people to do it TWICE, practically back-to-back on the SAME DAY is nigh impossible. This is why exceptions, concessions, and grace periods are needed. Otherwise, everyone might as well eat, crap, and pee in their cars while Supercharging. And that would get rather messy. Stinky too.
Now, if you pardon me... I'm about to go take a four mile walk. Because I can.