Status: OUT
Observer's designed-for-composition architecture — Template Method enforcing pre-notification consistency, ChangeManager bridging to Mediator for complex multi-subject scenarios — achieves reliable multi-pattern integration only while observers' mutual ignorance does not trigger cascading unexpected updates; when multiple observers on overlapping subjects create implicit feedback loops, the composition's reliability degrades despite its architectural safeguards.
Observer's composition architecture provides reliability mechanisms that unexpected cascading updates can defeat
Depends on (SL): observer-consistency-via-template-method, changemanager-mediator-observer-composition