Thats the problem with some dashcams today, they have no notifications to alert you getting back into your car, so if its something small, or on the other side of your car, chance are you will not see it right away.
On the other hand if you have a notification like that, if parking guard are not well tuned, you can get back to your car and get told there have been 27 events, and you can not find a scratch on your car.
So while i do think those notifications are much needed part of parking guard, then getting parking guard triggers to be accurate are just as important.
And right now things are up in the air, and users just have to make the best out of what we got.