Status: OUT
Observer's principled composition architecture — SRP-grounded decision making for Observer-Mediator composition combined with Template Method safety guarantees for pre-notification consistency — delivers reliable multi-observer notification only while the unexpected-updates liability (cascading changes triggered by mutually unaware observers) is managed through explicit coordination protocols.
Principled composition architecture is sound in theory but bounded in practice by the unexpected-updates cascading liability
Depends on (SL): observer-designed-for-pattern-composition, srp-grounds-observer-mediator-decision