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The focus of the tape discussion seems to have been qualitative. I brought up the doubling up of the tape in order to help with dealing with the wearing of the tape during the heavy cutting of a...

Wrong.
There is no logic to that statement. The "difference" remains the same. It does not become massive upon removal.

One layer of tape slightly increases the angle of the bevel. Two layers increase it more. Two layers offer more protection during bevel setting but going back to only one layer brings the angle...

You don't need tape, but when doing a lot of steel removal during the initial stages of a bevel set on a heavier grind of razor, you are better off with 2 layers of tape. As the top layer wears away...