I'm restoring a CCCP Certifyd Shell. Turning out really well but it made me wonder if there is a break off point on the finish. I saw a video on the web of a restoration where the restorer was actually buffing a strop. Can you make them too smooth?
I don't think so.
When you consider a Kanayama 90k is like using freshly sharpened skates on newly flooded ice.
What you put on the surface could make it less effective or sanding too deep.
If you sand too much away you'll get through the skin/shell material into the suede/flesh material and THAT will change the strop significantly
But if you don't do that, you'll change the feel of the strop, but no you can't make it too smooth. I think (ideally) the natural texture of the leather itself is doing the work, more than any tooth left from sanding.
I don't think you can make it too smooth as many like slick, lightning fast strops. Even sanding through the skin will leave a nice brushed/mat finish that will have a heavier or even velvety draw and still work just fine. Yes, sanding will change a strop for sure but likely not for the worse.