> I fear that fovea-tracking will remain scifi dreams in my lifetime, so the reality is we need to render full resolution throughout the field of view to be prepared for where the eye gaze might go in the next frame.

This is not at all true. All of the AVP, the Quest Pro, and the PSVR2 do eye tracking based foveated rending. They lower the clarity of the things you're not looking at. And reviewers say it works perfectly, like magic. They are unable to "catch" the screen adjusting for what they're looking at.