Performance and display/optics.
Non-VR games are still very far from being indistinguishable, though they’re getting there. Even if they got there, they’d need to pump out many times more frames they currently do.
Then you’d meet the limits of the displays and the optics. You’d need them to refresh much faster and be even denser and brighter. You’d need the optics to enable what’s called light field displays to come into existence, so that your eyes are not being coerced to a fixed focal point.
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