I am not sure where I come down on this. I love anything that encourages tuition in the folk arts. But being a piper (or at least trying to be one, calling myself by this name is a bit presumptive) I know that no two pipers play the same tune the same way twice. In fact, the same piper rarely plays the same tune the same way twice. Paddy Clancy was known for this. I would say that fiddlers would be the same. The way one colors a tune with grace notes and incidentals is completely interpretive. One could judge based on usage, but even that is completely subjective as to what the judge likes or dislikes.
I guess that these things are good up to a certain level, to judge basic competencies, but the music and the musician are completely intertwined on a personal level, and based on what is going on in the moment. The only judgement that is relevant is that of the audience and the musicians around the piper, IMO.