Status: OUT
The GoF catalog converges on a composition-centric paradigm: structural flexibility relies on abstract coupling via composition, behavioral decoupling uses composition-based object patterns across all four sender-receiver topologies, and extension mechanisms from skin (Decorator) through guts (Strategy) favor composition over inheritance — establishing composition as the single unifying principle of the catalog.
Three independent depth-2 conclusions about flexibility, decoupling, and extension all converge on the same mechanism
Depends on (SL): abstract-coupling-composition-dual-foundation, decoupling-topology-composition-based, extension-spectrum-converges-on-composition