But your skin is not a solid block of iron. So even razors with negative exposure can still provide a good shave, because the skin buckles up ahead of the razor and the base of the whisker can still hit the blade.
Granted it is easier to get a close shave using a razor that has positive blade exposure.
Nobody even remotely suggested that the skin behaves like “a solid block of iron”, but precisely because the skin buckles up ever so slightly in front of leading edge of the razor head the skin is pulled taut (i.e. flattened) behind the the leading edge, where the blade does its cutting action.
As far as “good shave” is concerned, I don’t dispute that one can get a “good shave” (however one may define that) from a razor with recessed blade, but a razor with neutral or positive blade exposure has the potential for a closer shave.
B.
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