>
”... Staff already taking care of the
cluster.”“The” cluster, singular ...
This is the catch. If you need security and compliance, you can’t today derive the benefits of re-use by other teams.
Given today’s distros, and assuming your threat model needs to account for insider threat, you need a different cluster for each data ownership grouping and data sensitivity level. For four teams with three levels of data, you’d need twelve completely independent clusters.
Unless, as noted above, you’ve done a ton of in-house multi-tenancy work to provide full stack security and compliance assurances and audits.