Status: OUT
The event architecture's Observer cascade liability is structurally addressable within the catalog itself (ChangeManager demonstrating self-healing via Observer+Mediator+Singleton composition), making the event architecture's engineering discipline potentially self-repairing rather than dependent on external safeguards — provided Visitor's encapsulation breakage does not compromise the compositional integrity that enables such self-repair.
Self-healing composition capability within a fully characterized engineering discipline yields self-repairing architecture unless compositional integrity is compromised
Depends on (SL): changemanager-resolves-observer-liability-via-pattern-composition, event-architecture-engineering-discipline-fully-characterized
Unless: gof-visitor-breaks-encapsulation