The draft does a good job of identifying business benefits of identity federation, and provides a bullet list of them in Section 9. Conclusion & Other Considerations:
The ability to consistently manage and understand risk across multiple organizations,
The ability to limit organizational costs associated with managing individual identities,
Streamlined user experience due to fewer credentials,
The ability to scale and expand customer bases,
The ability to provide more online services, and
Increased ease of access to shared resources.
It might be more hard-hitting to move this list to the front of the draft.
Also, suggest a couple of additions to the list:
Minimize the replication of users' PII across the Internet, reducing risk to users and liability of RPs
Improve security by providing more-current access information (user attributes) to RPs and limiting risk of use of revoked or obsolete access privileges
Federated SSO improves incentives for users to acquire a single high-quality credential to replace multiple passwords
Improve the economics of ABAC by enabling re-use of user attribute data
The draft does a good job of identifying business benefits of identity federation, and provides a bullet list of them in Section 9. Conclusion & Other Considerations:
It might be more hard-hitting to move this list to the front of the draft.
Also, suggest a couple of additions to the list: