Voids seems to be colateral damage, a consequence of the geometry of backbone and sidechains that just happens along the way to a finely folded protein. Yes, it is good information. Perhaps, even useful to the more adroit folders out there. But it seems to be what's left over when the story is finished; not the story itself. It's like trying to draw a birdcage by drawing the spaces between the bars. The spaces are the voids; the bars are the backbone and sidechains.
What folders want as feedback is what are the forces acting on the various sidechains and where do they come from. A void is just a left over piece of space that occurs as a result of the interactions of the geometry of the backbone and magnetic forces of sidechain atoms.