Status: OUT
GCP managed services (Pub/Sub, Secret Manager) require application-level production awareness that cannot be abstracted away by platform configuration: Pub/Sub demands explicit throughput-correctness decisions (ordering caps at 1 MBps/key, exactly-once is pull-only and regional, dead-letter counting approximate) while Secret Manager demands version pinning, API-direct access patterns, and rotation event handling — contradicting the "fully managed = no application changes" assumption.