I'm guessing the "cues" mentioned are triggering the app to show up on the lock screen. Without it you'd be forced to sift through your apps every time you back up. I don't think there's any other way to know for sure you're in a car and will be backing up soon. Ideally you'd want your backup camera on before the accelerometer knows you're backing up.
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Aha! The OBD port connection isn't even necessary since it's a trip to the phone UI anyway.
So why OBD?
I'm guessing the "cues" mentioned are triggering the app to show up on the lock screen. Without it you'd be forced to sift through your apps every time you back up. I don't think there's any other way to know for sure you're in a car and will be backing up soon. Ideally you'd want your backup camera on before the accelerometer knows you're backing up.