Peter, I think it makes perfect sense. The higher the sampling frequency (in this case scanning resolution) the more accurate you will be able to capture the shape and size of the grain. In fact, with regular developers (no stain) the image structure should be almost monotone, pretty much the gelatin plus the grain. At 6000 dpi a gray surface in grainy negative should show an histogram with a couple of bars instead of one in the middle.
The worst scan resolution should be the closest to the grain size and once you are over twice the grain size the sampling error becomes smaller and smaller (check Nyquist frequency in wikipedia). It also explains why so many love TMY more than TMX.
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