A 20-year-old in Nagoya worked nights answering customer messages for a kitchen store in America. The same complaint came in over and over: I bought another sharpener, it ruined my knife, I'm just going to buy new knives. He couldn't understand it. In his family's restaurant, a sharp knife was normal. His father had sharpened his own on a stone every night for thirty years. So he watched his father's hands for months, and finally saw what nobody had told those Americans: the angle never moved. Then he built the first tool that holds it for you. Roll it down the edge. Thirty seconds, any knife in the drawer. It's called Hatori. 60% off + free shipping, limited time — see it below.
Not enough history yet to show a trend.