The biggest problem in American home kitchens is dull knives, usually a lot of dull knives. A dull knife is the biggest obstacle to easy food preparation because it forces you to press down too hard to cut through a vegetable so that youโre smashing through it rather than slicing through it. This makes prep work unnecessarily difficult and also affects the flavor of the food. It can also result, when the knife slides off the food rather than through it, in bad cuts on your hands. A sharp knife is a safe knife.