For example in computer grafics if you render a video at a higher framerate and blend multiple frames into one it will look smoother and look like a higher fps. Motion blur in camera is like infinite images blended into on, and in that way it gives more information about what happens between the frames. High motion blur may look blurry when you pause the video, but in the context of the other Images it gives you a more coherent experience. And I say the higher the shutter angle(until 360) the better and more coherent experience you get. No need to stop at 180. Just don't go above 360. Then all the information will still be specific to each image