When you shoot in AutoMotion mode, the app analyzes the gyroscopic data of your phone in real-time. It differentiates between intentional movement (a pan or a dolly) and unintentional noise (shaky hands or footsteps). The result is footage that looks like it was shot on a $300 gimbal, but was actually recorded while walking briskly down a sidewalk.
For years, the unwritten rule of mobile filmmaking was simple: if you want smooth footage, you need a gimbal. The DJI Osmo Mobile or the Zhiyun Smooth series became the crutch for creators trying to eliminate the "micro-jitters" inherent in handheld smartphone shooting.
It is a viable B-camera or run-and-gun tool. The Log profile holds up surprisingly well in post-production, though it won't match a dedicated mirrorless camera in low light.