just to through in some pieces: The interesting article seems quite ... "old".
Verhoeven could not see any effect of plain leather on steel edges at 2.000x magnification done with SEM, at all!
It however is interesting that it is obviously possible to maintain a shaving edge with plain leather much much longer,
than without. So there must be an effect to some degree.
Pasted leather will (pretty fast) create a rounded appleseed bevel.
Thatīs like a multi-bevel. If done correctly, there is nothing wrong with it.
My theory what plain leather does is rather bend the steel, than abrade it.
Verhoeven showed that the highest possible polishing action is not only an abration
but a plastic flow of steel, not because it melts, but because of the same reason you can bend aluminium foil, but not a bar of 20mm Al
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