Cybersecurity/infosec is much like driving a motorcycle. You can purchase the best helmet in the market, providing the most thorough protection for your brain. If you get in an accident, your brain may be fine, hwoever the rest of your body is in bad condition.
Infosec needs to be globally applied. If you are only protecting one portion of the system, there are many others areas that can be breached and damaged by an attack.