Yes, obviously if he had've provided bearing and distance information, it would've provided better situational awareness for everyone on the CTAF.
All the same, in general i think it would be good for all the VFR guys not familiar with an RNAV approach to have it explained to them. Although not ideal, if they were given a situation like you have mentioned where the aircraft is approaching waypoint Whiskey Echo, they would know immediately that the aircraft is roughly to the west of the aerodrome roughly 15 miles out, and they can then determine the potential for conflict.
I don't think there is any excuse for IFR pilots, particularly in VMC, to not be giving position information that can be readily understood by everyone on the CTAF, but if all pilots had a rough idea of how an RNAV approach is created, it would be safer for everyone.