I'd be very interested to see a few "before and after" photographs of blades which have been palm-stropped; a couple of passes each side/edge only.
I've tried palm-stropping (or more precisely, edge of hand) on blades which I consider rough, but it's difficult to determine whether it makes any difference, or if it's all down to psychology and perception. I think high-magnification views would go some way to showing if this works, or is just a shaving "myth".