Relational Avoidance and Simulation Substitution: V43 Diagnostic Addendum

This diagnostic addendum applies the v43 architectural grammar to an observed pattern of relational avoidance and AI-mediated substitution under contemporary cultural conditions. Treating the phenomenon as a system under strain rather than a moral or psychological problem, the analysis examines how asymmetric cost–risk exposure, boundary degradation, and substitution pressures redistribute relational function across human–human and human–AI interfaces. The document maps failures in entry, exit, repair, and role boundaries, and shows how substitution via simulated interaction stabilises behaviour locally while leaving underlying structural conditions unresolved. Distinctions between contained and expanding simulation are used to identify where substitution functions as supportive infrastructure versus where it signals unresolved boundary failure. The purpose of the analysis is not explanation, prediction, or prescription, but to establish structural intelligibility and demonstrate the use of v43 as a real‑world diagnostic stress test. This work belongs to the Architecture of Limitation research program.