Resting the blade will allow the edge to realign, the memory properties of carbon and stainless steels are well established. But, there is no need to do this if you strop after use (i.e. there will be no harm from not letting the blade rest), and the benefits, if any are slight. I do not strop after use, and my blades do get to rest for about a week between uses. It is true that I can skip stropping for one cycle if pressed, but I really do not do this. I do sometimes leave my strop at home for short trips, but even then, I do a few passes on the heal of my hand.