DFC : "The service you are providing is Air Traffic Control.
The Classification of the Airspace governs the separation you are required to provide between flights.
If you can separate those flights that you are required to separate proceduraly then there is no requirement for you to use radar."
I disagree.
An Air Traffic Control service also includes an alerting service. By DFC's logic, if I have only one aircraft under my control in my sector, then separation is achieved without further ado.
However, I'm not relieved of my responsbility to provide an alerting service, and in the en-route IFR environment, failing to positively identify the aircraft reduces the quality of this service.
If you have radar, and time, identify.