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部署模型决定边界成本Deployment Model Defines Boundary Cost
选择单租户、多租户或混合部署，不是“技术偏好”，而是“治理成本模型”。架构越清晰，后续合规、排障、审计的成本越低。Choosing single-tenant, multi-tenant, or hybrid deployment is not a tech preference but a governance cost model. The clearer the architecture, the lower the long-term compliance and incident cost.
控制平面是一致性的来源Control Plane Is the Source of Consistency
在多个业务系统中，最常见问题不是规则不存在，而是规则不一致。统一控制平面能够让认证策略、授权策略和审计策略保持同一语义。Across business systems, the common issue is not missing policies but inconsistent ones. A unified control plane keeps authentication, authorization, and audit policies semantically aligned.
这让企业在扩展到新应用、新团队、新区域时，避免重复实现和策略漂移。This helps organizations avoid duplicated implementations and policy drift when scaling to new apps, teams, and regions.
可运维性是企业级分水岭Operability Is the Enterprise Differentiator
高可用、故障转移、可观测指标与回滚机制，决定身份系统是“能演示”还是“能长期运行”。架构设计必须把这些能力当作一等公民。High availability, failover, observability, and rollback determine whether identity can operate long term or only demo well. Architecture must treat these as first-class capabilities.