This post was a bit difficult to parse; that's what it sounded like to me, although more as a interface-cleanliness feature than a rendering optimization. There also seemed to be an element of a non-euclidean/non-consistent-geometry idea there. (Which makes some sense - if you lean in or turn your head to get more UI detail you don't necessarily want it to take over your entire field of view. Although personally I think this might have the same problems as a "Minority Report"-style UI regarding long-term usability.)