In order to effectively comprehend the scope of IIoT security, we need to keep the divergent operational dynamics and priorities of IT and OT in perspective, and mainly those that have evolved over the past decades. This divergence impacts the approach to security as well. The adoption of standard-based IT technologies in OT environments necessitates the adoption of IT security best practices as well. However, these practices must preserve if not enhance the safety and reliability capabilities of industrial systems, and the ability to protect physical assets and processes. These distinguishing characteristics render IIOT security a considerably challenging feat that we must achieve.