From what I have seen, Ring can only notify if a person and/or motion activates the camera. If you turn off the motion, but leave person on, and a car drives up, the camera sees it as a motion event. Which means it will not tell you when a person is coming to the door. If you turn on motion it notifies on everything (including when a cat walks by and yes that is with your supposed smart alerts active, which that feature is useless).
You have the 3D motion, and can recognize a person, you should be able to recognize a car with little effort. Why not add that detection and have an option to detect person/vehicle and/or motion? Just person or notify on most everything is not useful at all (becomes like a car alarm, no one pays attention to those anymore). You could also just add a height perimeter of like 3 feet tall or something, not many (if any) adult humans are shorter than that, but most wildlife is shorter.
I don’t know the solution 100%, but turning the sensitivity down (makes 0 difference on motion alerts) and adjusting the zones and all that does not work on a cat. And no notification when a car pulls up, just because a human didn’t walk up is not a valid solution either.