Well, we can say that the driver is quite considerate by ensuring that his car is parked all the way in. However, that may put his precious ride at a little risk. If he does not bring his car to a complete halt in time, the bumper would have hit the wall. Or, if he has pressed the boot release button intentionally or unintentionally, the bottom of the boot might have a good chance of scrapping the wall, leaving behind unsightly scratch marks. Such damage might be too minor to call for a costly paint job but makes you upset whenever the scratch marks appear before your eyes.
After driving a car for some time, most of us should be familiar with the sensitivity of the reverse sensor and make the correct judgment on how much to reverse. It is not worth to push our luck too far.