In May 2026, a technical report in surface coating industry refreshed the evaluation standard of PVD coatings, correcting the long-standing misconception that coating quality is merely measured by hardness and film thickness. It explains that products processed with identical equipment and technical parameters show drastically different service life, and coating failure rarely originates from coating itself but four key parts: substrate, interface, inner structure and coating surface. The substrate sets the ultimate load-bearing limit; improper base material deformation leads to coating cracking and peeling. Proper ion etching builds stable interface bonding while insufficient cleaning causes full coating detachment. Evolving coating structures including multi-layer and nano-composite dominate wear resistance and high-temperature resistance. Besides, surface roughness and particles easily trigger stress concentration and crack initiation. This innovative framework optimizes failure diagnosis for cutting tools and precision molds, facilitating full-process quality control in PVD manufacturing. https://www.tiktok.com/@mia_iota/video/7597717976720149782