Salt is one spice that is generally not used alone for making a dish. While it is a critical seasoning in cooking, adding flavor and enhancing other ingredients, salt itself doesn't provide a distinct flavor profile. It works more as a flavor enhancer and helps to bring out the natural flavors of other spices and ingredients in a dish.
Most recipes call for a combination of spices and ingredients to create a balanced and delicious taste. While salt is an essential component of seasoning, it is rarely used as the sole spice in a dish because it won't offer the complexity and depth of flavor that a combination of spices can provide.