Structural, logical, and organizational coupling capture different dependency and coordination phenomena in software projects, yet their relationships and practical relevance in industrial monoliths remain unclear. We investigated how these three types of coupling were related, how reliably they identified interdependent components, and the challenges and intrinsic benefits they presented to software practitioners. We conducted a mixed-method study in two large monolithic projects developed at Cadmatic. We extracted structural, logical, and organizational coupling, analyzed their correlations and agreement using non-parametric statistical methods, and complemented the results with practitioner focus groups involving the Cadmatic Development Teams. Structural coupling showed weak correlations with the other metrics, while logical and organizational coupling were strongly correlated. Agreement among the three metrics was generally low. Practitioners reported 17 issues and 8 benefits across the coupling types, with organizational coupling causing the most recurrent coordination and knowledge-sharing challenges. The three coupling types captured complementary architectural and socio-technical phenomena, and no single metric adequately characterized real dependencies in the studied Cadmatic projects. Combining multiple coupling perspectives can better support refactoring, coordination, and architectural decision-making in industrial environments.