Every time I buy sometning that is not Motorola I regret it, and it is like 85% because of this feature. I don't know how they do it, but it triggers reliably, never misfires.
People always suggest apps that supposedly should allow the same thing, but they never work, which makes me think Motorola uses some lower level sensor access to do it.
Shake to flashlight is the perfect combination of easy to remember, easy to trigger, and actually useful. It should be industry standard.
On a hike a few moons ago, as I approached a scenic overlook, another hiker pulled out their phone, twisted it, and took a picture. We had a brief conversation about our love for Motorola gestures.
If Motorola comes out with a lower priced phone with GrapheneOS and a Pixel quality camera or better, I'm there.