Here’s the thing for me. That motion sensor is going to be more accurate than the camera sensor. It’s also less sensitive to light changes, shadow movement, etc, But the best thing is you can position it in a place more isolated and accurate than the camera, which needs power. These battery replaceable sensors are small enough to put anywhere. The sensor at my front door is facing the door and not the street so accuracy is almost 100% so far. Every doorbell cam has it’s sensor facing away from the door toward the street generally, Most people will end up ignoring their notifications eventually. Not now.