Worth noting that, on their own, namespaces are not security boundaries, they're (IMO) primarily intended to be organizational constructs. What namespaces do a

Worth noting that, on their own, namespaces are not security boundaries, they're (IMO) primarily intended to be organizational constructs. What namespaces do allow for, from a security perspective, is for various controls (e.g. RBAC, Network Policy, Pod Security Admission) to be applied to a given application or group of applications (depending on how you've organized your namespaces) in a relatively controlled fashion.