This sounds like the vast majority of Tesla owners will find it pretty useless (for anything other than backing down a long home driveway, which is really a different application of the technology); yet it will be very annoying to everyone else in the parking lot when the few owners who do try to use it in workplace or public lots insist on "experimenting with it" in those settings.
Also, that description, while likely quite accurate, sounds nothing like the new description on the Tesla website: "Summon: your parked car will come find you anywhere in a parking lot. Really. "