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The dynamic gaze example really convinced me that eye tracking will be necessary for immersive VR. If you can achieve a 1+ order of magnitude improvement in rendering performance with no noticeable loss in quality... it would be very difficult to leave that on the table.

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You can also use a lower frame rate for the foveal input.

What peripheral vision losses in spatial resolution, it wins back in time.

Not necessarily. The "lower framerate" in our fovea is not represented as a stuttering sequence of frames, but a blurry and smooth flow. Simply using a lower framerate would still be noticeable.

Unless you could engineer a display technology that could do this.

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