1. Proposed title of this feature request 

For the new PinnedImageLists, there is a validation check to ensure that the image is using a sha format.

https://github.com/openshift/api/blob/master/machineconfiguration/v1alpha1/types_pinnedimageset.go#L76

This is an unnecessary restriction for the feature that seems to only be enforced because of the intended use of this feature. Being that this is a public API for people to define their own images to be pinned, this should not be restricted to only images referenced by sha.

https://github.com/openshift/enhancements/pull/1481#issuecomment-1758286953

Because of this unnecessary validation the feature is entirely unusable to customer.

3. Why does the customer need this? (List the business requirements here) :

This will render the entire feature of disconnected upgrades described by

https://issues.redhat.com/browse/OCPSTRAT-763

unusable. And customers will have to implement our own replica of this capability.