Operational excellence vs. ...

I understand your viewpoint. That being said, we know that customers are often concerned with only a subset, sometimes just one, of the six pillars. There is some known overlap. For example, not implementing a security best practice of rotating credentials could impact your reliability if the credentials are no longer valid and your workload is unavailable. The best practices are grouped according to customer feedback on where the best practice applies and where we have seen application enable success.