I think the CPL test should be done the old fashioned way. Mental calculations and DR. The examiner wants to see your thought process, not messing round with gizmos on your map.
I see your point, but where do we stop? Should students time legs using the position of the sun/stars rather than a wrist watch?
Gizmos like VOR track don't really remove the though process IMHO, just as a wrist watch doesnt detract from leg times.