Preventing IoT edge device vulnerabilities

As an EDA toolchain provider, Siemens Digital Industries Software keeps a close eye on security issues that occur in the world of electronics. We see volumes of research centered on protecting complex SoCs from attacks and interesting studies about detecting malicious logic in these ICs. But, security issues around IoT edge devices are rarely mentioned in the literature. However, the projected billions of IoT edge devices out in the wild makes for a vast attack surface. Should hardware designers be concerned about security for IoT edge devices? And, is it worth the effort and cost to ensure security at this level?