On Motion blur, our eye’s motion blur, and camera’s shutter speed motion blur are not the same. Eyes don’t have a shutter speed. Whatever smearing we see is the result of relaxed processing on the brain side. Under adrenaline with heavy focus, our motion blur disappears as our brain goes full power trying to keep us alive. If you are sleep deprived and physically tired, then everything is blurred, even with little motion from head or eyes.

Over 99% of eye movement (e.g. saccadic eye movement) is ignored by the brain and won’t produce a blurred impression. It’s more common to notice vehicular fast movement, like when sitting in a car, as having some blur. But it can be easily overcome by focused attention and compensatory eye tracking or ocular stabilization. In the end, most of these graphical effects emulate camera behavior than natural experience, and thus are perceived as more artificial than the same games without the effects. When our brain sees motion blur it thinks movie theater, not natural everyday vision.