Quote Originally Posted by neo71665 View Post
The "sharpening" you see them doing is to straighten the edge. Even with the most fine stones the razor's edge will form a roll on it from the pressure of sharpening it. Think of the razor edge as a J shape the leather only straightens the hook out.

The smooth leather does nothing more than to straighten it out but in turn does make it sharper. Plain leather will not sharpen by removing the metal.
So it's like the difference between using a burnisher on one's kitchen knives instead of a sharpener, right?

Cheers