Auditors and the Shared Responsibility Model
Many industries require you to show compliance in your cloud environment as it relates to industrial controls.
Using and understanding the shared security model will help you and your auditors understand which controls you, as the customer, are responsible for and which ones are the responsibility of AWS, the cloud provider.
Suppose your auditor is requesting information or evidence for something that AWS manages. In that case, you can refer the auditor to the specific shared responsibility model for the service to show how the cloud service provider maintains control of that particular standard.