The theory of evolution does have practical use in explaining why species look the way they do, why fossils look the way they do, and why genomes look the way they do. The theory of evolution has endless practical use in explaining natural history.
It may not be important to you, but it is very important to biologists. You see, biologists are curious. You may not be curious, but scientists are. They want to know how nature arrived at its current state.
Are you really saying that knowledge isn’t worth pursuing unless it has immediate practical use?