After reviewing the SAP/SAR workbook I noticed the FedRAMP methodology bundles NIST 800-53(a) granularity into larger single scope sections. Which in turn makes it less likely an organization will pass the control, even partially.

Any reasoning behind this?

Example: theoretical...

Control in NIST AC-1.a[1]....[2]....[3] all separate granularity auditing sections.

Control in FedRAMP AC-1.a[1,2,3] one single audit section.