A utility knife performs a very specific function which is why it is favored in most setups. You can make precision cuts and slices in seconds. Once the blade gets dull, you can swap it out for a new one for a small price. For any user that does work around the house, it is a necessary tool. Utility knives are even purchased by customers that do a lot of arts and crafts. With all of the situations where having one would be appropriate, every household should have at least one for emergency use- even if it isn’t in the toolbox.