Status: OUT
Boundary adaptation (Adapter/Facade via DIP) and internal extension mechanisms (Decorator/Strategy/Template converging on composition) together provide comprehensive coverage for system evolution — addressing both inter-system coupling and intra-system variation through composition-based patterns.
Coverage is robust only when DIP abstractions are designed thoughtfully — mechanical interface wrapping adds noise instead of flexibility
Depends on (SL): adapter-facade-implements-dip-at-boundaries, extension-spectrum-converges-on-composition
Unless: dip-overgeneralization-pitfall