Foveated rendering doesn’t stop streaming if the user isn’t looking at the window. Just streams in lower quality.
If you would just trivially stream all windows to the vision of course it will at some point be at the limit of current technology. But I would assume a company like apple has the means to push the state of transmission media (rather than just using a now 4 year old standard) and be able to think of something smarter than „just stream all windows in maximum quality even if the user doesn’t look at them“
I may be wrong but it honestly doesn’t seem realistic to expect seamless, latency free foveated rendering switching at those speeds while coordinating between two devices.
If you would just trivially stream all windows to the vision of course it will at some point be at the limit of current technology. But I would assume a company like apple has the means to push the state of transmission media (rather than just using a now 4 year old standard) and be able to think of something smarter than „just stream all windows in maximum quality even if the user doesn’t look at them“