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As you might know all sharp edges (knives, scalpels, etc) are not actually smooth but look like a crappy saw under microscope. The finer the stone, the smoother edge it will produce (assuming the steel will allow). Useful in cutting instrumented, perhaps not so much in skates, but in principle it can extend life of the edge normal wear by some margin as sawteeth are easier to wear off than a smoother edge. I doubt the benefits will be noticeable in average skating. Obviously cosmetics is the other aspect. Coarse stones are for honing regular steel with brushed look. It is fast and when it scratches the steel, you can not really notice that anyway. You would want to go to finer grit stones if you deal with mirror finish and coated blades where the scratches and abrasions will be an eyesore, but finer stones would take more time to remove burrs.

That's an important point with VH. You can (and should) be tying your skate significantly less tightly than you're used to. The boot already wraps to your foot - you don't need to tighten it to gain more wrap.