I got into a discussion about this very topic with a carpenter pal of mine. He showed some genuine interest in straight shaving and thats what really started the conversation off. For his planes, he uses a 2000 grit as a finisher. Also, he moves the steel on the hone at a 90 degree angle to how you would hone a straight razor. My theory is that this would reduce the chance of a possible wire edge, but I really dont know why. He claims he was taught to hone his edges from an old Italian guy, Apparently, this old fella would walk around the shop with a 'high grit' stone and the blade, just rubbing them on each other. My pal seems to think the old fella would take a few hours to hone up a plane blade for use. The plane blade has a different use that a razor blade. I have trouble comparing the two. But I can see some rationale there if the plane sharpening methods were some of the only bits of information available at the time.