Even if they were double the resolution per eye, you aren't going to have "native" 4k reproduction because you are looking at a projection of a screen rather than an actual screen. What is the value of achieving one "accurate" pixel if it is surrounded by eight bilinear-interpolated ones?
But then, you usually don't buy a 4k screen because you can perceive the individual pixels either, unless you are creating content that requires that.
I suspect it aligns easier with the quality concerns of reality and not with virtual components - if I can use a monitor through the screen with no noticeable loss of quality or additional eye strain, there's no reason to think a virtualized monitor won't be at least as good.
But then, you usually don't buy a 4k screen because you can perceive the individual pixels either, unless you are creating content that requires that.
I suspect it aligns easier with the quality concerns of reality and not with virtual components - if I can use a monitor through the screen with no noticeable loss of quality or additional eye strain, there's no reason to think a virtualized monitor won't be at least as good.