What is the point of MovePosition()?

"what does MovePosition() do that transform.position doesn't?"
- computes the Rigidbody's velocity internally based on the resulting motion.
- applies the correct physics effects in the other non-kinematic rigidbodies.
- interpolates the resulting positions based on the Interpolate setting of the rigidbody.

For the above to work correctly MovePosition() must be called once within each FixedUpdate() with a "stream" of continuous positions.

The following will cause wrong effects in the rigidbody motion:
- Calling MovePosition() from Update().
- Feeding the same position in two or more consecutive calls. That will "stop" the motion and the internal velocity will be calculated as zero that physics frame.