Classification is useful and helpful in ways like -
→Classification gives better knowledge and understanding of organisms that are studied.
→It helps to study the organisms in a proper and systematic manner.
→It helps to make comparison in an easier way .
→It helps in understanding the relationship among the organisms and their interdependence.
→Classification makes our study more focused and helps us to handle huge population of organisms.
→It gives us an idea of evolution.
So we classify organisms as the classification is necessary.
Hope this helps you :))