use of mixins class defined in Django rest framework

Question

What is the actual use of Mixins class? I don't really get it. All the mixins classes like CreateModelmixin, Listmixin, etc features are already available in class-based view like ListCreateApiView.

For eg:

class ExampleView(ListCreateAPIView
                 DestroyAPIView,
               RetrieveUpdateAPIView):
    queryset = Example.objects.all()
    serializer_class = ExampleSerializer
    pagination_class = CustomPageNumberPagination

Using mixins we can do it by following:

class ExampleView(ListAPIView,
                     mixins.CreateModelMixin):
        queryset = Example.objects.all()
        serializer_class = ExampleSerializer
        pagination_class = CustomPageNumberPagination

When I check https://www.cdrf.co/ I see the methods that are available in CreateModelMixing are the following:

def create(self, request, *args, **kwargs): 
def get_success_headers(self, data): 
def perform_create(self, serializer):

These methods are already available in ListCreateApiView, then why Django went to create this useless class??