I have looked at razors that have rested and those that have not up to 90x on a stereomicroscope and cannot see any difference in the edges. I have not noticed any difference in how they shave either. It seems to me that if the edge is that sensitive and needs time to "rest" as soon as you either strop it once or make that first shaving motion, the edge would be screwed up again. So... go figure. But, hey, I'm not a metallurgist.