Status: IN
Bridge's degenerate Pimpl form (single implementor hidden behind an abstraction boundary) illustrates that abstraction-implementation separation can provide compilation firewall and dependency isolation benefits even without polymorphic variation. Combined with DIP's structured architectural mechanism — which defines formal principles, concrete implementation strategies, and an ownership rule for dependency direction — this suggests that disciplined dependency management through abstraction boundaries has value beyond enabling polymorphic flexibility.
Pimpl as degenerate Bridge proves DIP's value persists without polymorphism
Depends on (SL): bridge-pimpl-degenerate-case, dip-complete-architectural-mechanism