Cladistics is useful for creating systems of classification.
Cladistics is now the most commonly used method to classify organisms. Well, it's obvious that a system of classification is needed. That is, we need words like beetle or conifer so that we can talk about many organisms at one time. In fact, the history of formal classification schemes in biology is long, dating from the 1700s, well before Darwin proposed his theory of natural selection. Today, cladistics is the method of choice for classifying life because it recognizes and employs evolutionary theory.