Logically I wld like to presume as follows:
1. After sharpening, the first stage of degradation is a fold due to contact with board or hard stuff.
a) ON the Strop, I suppose you can only do Edge training strokes. What happens is that the fold is "unfolded", giving an edge that is sharp but a weak edge which is prone to what some people calling metal fatique which will eventually break off. Just l;ike a paper clip fold and unfold adn it breaks easily...
b) IF you strop adn strop adn "fatigue it it enough.. it will break off.
c) When it does break off, I also assume that it leaves a slightly "rounded edge" but still thin enough. IF the compound used is abrasive enough, the may remove the roundedness or some steel and thus making 2 angles meet adn its sharp!
I personally prefer to hone it on teh smoothest rod I can find with teh Edge leading/ cutting stroke adn then followed strop on leather ( rough side)if so desired.
When I have to hone it on leather, INitially I would do it at almost 40 degrees angle adn hope that it breaks off and folded edge adn then followed on the desired angle( 15 degrees) and possibly back up to 20 degrees.. there about.
Hope this helps adn it does make sense (?)..
RGds adn Stay Sharp...
D