Odd because Shutter Off would likely increase motion blur depending on your frame of reference. It may depend on what the camera calls “shutter off” but that would mean shutter is at the frame rate. 1/30 for 30fps instead of 1/60 for example.
“Stroby” as in Saving Private Ryan is due to a very FAST shutter speed which is very much not the case with any camera I know of with Shutter Off.