Industrial networks must meet stringent requirements for security, robustness, and performance to ensure stable and reliable process control in automation environments. These networks achieve the requirements by using isolated and independent special-purpose segments. However, the transformation towards more flexible and modular (SFs) introduces significant challenges. We identify three major transformation factors demanding novel solutions to maintain industrial standards: growing interconnectivity, expanding multi-tenant capability, and increasing application dynamics. This work analyzes the tension between the fundamental requirements and the transformation factors driving the evolution of industrial networks. We also examine existing solutions, highlighting their inadequacies in addressing the comprehensive needs of SFs. The aim is to identify open areas of research necessary for developing equally secure, robust, and high-performing networks in modern industrial settings.