Yea, but if the display was a "virtual" 50cm away, it could be a much lower resolution, or a much bigger size. The pixel density doesn't need to depend on the r

Yea, but if the display was a "virtual" 50cm away, it could be a much lower resolution, or a much bigger size. The pixel density doesn't need to depend on the resolution of the virtual screen, it just needs to be good enough so the user can't distinguish the pixels of the VR itself. Then any resolution can be accurately simulated in the VR.