Why would a dressing for a composed salad often be served separately?

A dressing for a composed salad is often served separately to allow diners to control the amount of dressing they use, ensuring that each ingredient retains its intended flavor and texture. This approach also helps prevent the salad from becoming soggy, allowing for a more enjoyable eating experience. Additionally, serving the dressing on the side accommodates individual preferences, as some may prefer more or less dressing than others.