This sounds dangerous. You’ll eventually get used to the warnings when backing out and wont even check if they’re actually false alarms. Little Timmy becoming pancake mix as a result.
Collision warnings are a backup system. The driver is also expected to look where they're going. Little Timmy will be just fine, unless he made little Sally cry, in which case he's fair game.
I am looking back and using my eyes to make sure the driveway is clear.