Lol why would you buy a $180 toothbrush? Brushing teeth is a solved problem with simple $0.5 brushes. Just be sure to rub all teeth and gums for 2 minutes. No need for motors and sensors.
It's just a scam that Philips is running in collaboration with dentists.
Electric toothbrushes do a better job of cleaning. The rotation/oscillation is better than what you can do manually. So the motors do a better job with less gum damage.
That doesn't explain having to attach BLE and an app, other than upselling "features".
Brand stratification and segmentation is a thing, but it's not a "scam", any more than any other marketing techniques.
It's just a scam that Philips is running in collaboration with dentists.