Why is taxonomy useful?
Taxonomy is useful because it helps classify organisms name them and also describe them. It helps determine where things go and where things need to be.
Cladistics is more useful than Linnaean taxonomy in most cases now. Before Cladistics, the Linnaean system was used, but has proven to be paraphyletic in many cases. This means that a lineage does not include a species' most recent common ancestor and logically doesn't make sense. Today, most biologists, zoologists and the like use Cladistics because it has more scientific support. The Linnaean system is a relic of the past now.