This article revisits ISA-95 in light of contemporary industrial architectures and representation needs. It distinguishes between the enduring industrial concepts introduced by the standard, the specific models used to organize them, and the growing challenge of maintaining coherence across distributed representations. Using the example of a functional equipment position, P101, and the physical assets that successively fulfil that role, the article examines the distinction between functional levels, applications and IT architecture, as well as between the Role based equipment hierarchy and the Physical asset equipment hierarchy. It also compares these structures with the more strongly structuring role of ISA-88 equipment entities. The analysis highlights the lasting relevance of many ISA-95 concepts while questioning the factorization of some models, particularly those introduced in Part 4. OPC UA, Unified Namespace, AAS and AI further expose the need to relate multiple legitimate representations without forcing uniformity, while preserving identity, context, validity and authority. ISA-95 thus appears less as an architecture to reproduce than as a body of reference concepts and models to be reassessed against contemporary needs.