If I undestood correctly he's unsharpening knives.

Or making knives that turn into overcooked noodles if you try to use them on anything except vegetables and acceptable meats

and who decides if I want to use a knife to cut mushrooms instead? see where I am going, there are (or could exist) legit cases when you need to use it in a non-standard way, one that the model authors didn't anticipate.