Good Point but you could wear contacts as a (poor) solution.
Also understandable, but 3d DLP projectors dont have this issue. Nor do active displays.
Your computer is only rendering 2 different Viewpoints and Page-flipping, When you consider you cant see a difference with AA on or off in 1080p, and most setups cant use AA in stereo 3d anyway, there really is no big Performance difference.