There might be something to the size of the razor relative to the size of the hand but I don't know about the grind being a consideration relative to the skin/beard. The qualification Torrey's manual makes that if the shaver is 'somewhat of an expert' strikes me. If someone is not an expert I would suspect they'll have issues with any size or grind until they develop their skills. Lately I'm preferring wedges, heavy wedges, over full hollows but I can shave just as well with one or the other.