After installation with the assisted installer, the cluster contains BareMetalHost CRs (in the 'unmanaged' state) generated by assisted. These CRs include HardwareDetails data captured from the assisted-installer-agent.
Likely due to misleading documentation in Metal³ (since fixed by https://github.com/metal3-io/baremetal-operator/pull/657), the name field of storage devices is set to a name like sda instead of what Metal³'s own inspection would set it to, which is /dev/sda. This field is meant to be round-trippable to the rootDeviceHints, and as things stand it is not.