Status: OUT
Composition's scalability advantage is supported by concrete evidence (Decorator's exponential advantage — n independent embellishments require up to 2^n inheritance subclasses but only n+1 composition classes) and is structurally demonstrated across three design scales (object relationships via abstract coupling, recursive data structures via Composite+Flyweight, system architecture via framework composition), providing strong evidence that composition serves as a primary reuse mechanism operating across multiple levels of system organization.
Quantitative proof (Decorator's exponential advantage) validates the qualitative claim (three-scale operation), connecting an orphaned depth-2 empirical result to the three-scale structural analysis
Depends on (SL): decorator-proves-composition-scalability, composition-operates-at-three-scales