Can't we just consider the distortion on the edges as "foveated rendering". I really don't think when we are focusing on the center of the scene (which we will be most of the time when playing) with our eyes, that we won't even notice the distortion on the edges.
Yes, if you search for the distortion with just moving your eyes and not your head, then you will see it of course. As foveated rendering will probably be mainstream in the future of VR, we need to get used it. I mean you seriously need to move your eyes to the edges (of your own eye socket) to be able to see that.
What are your opinions on it?