What advantage is a non-living cuticle in a parasitic organism...?

especially if the infection route is by way of mouth?What advantage is a non-living cuticle in a parasitic organism...?
In absence of a protective cuticle, a parasitic organism can easily be digested by the powerful digestive enzymes in the alimentary canal or digestive system of the host organism.What advantage is a non-living cuticle in a parasitic organism...?
it protects it from the harsh enzymes that it will face