Connect architecture to reliability and compliance.
Fault containment zones (supervision trees as firebreaks).
Idempotent change flow: make every effect replayable.
Backpressure and circuit breakers as "village gates."
Cultural tie-in: "You build it, you own it, you run it."
Bridge to real-world fintech or chat examples.
Isolation boundaries are not just technical. They are behavioral. They define who fixes what when things fail.