My friend and I had a discussion very similar to this notion. There was a time in electronic music when there were no subgenre definitions. There was no jungle, no happy hardcore, etc...it was all just music, and as a result the diversity was something to look forward to and appreciate as new artists had new ideas. The tendency for people to fit styles of music into subcategories is, in my opinion, a way of allowing the mind to take a simplified (frankly limited) perspective. Some artists add strongly to the mythos of full-on psychedelia Vs. progressive psychedelia...realisitically, these two polarities are simply two aspects of what psytrance could be, if they were to merge.
Progressive psy fosters elaboration and subtlety, while fullon goes for spine-chills and ecstatic moments.
The boundary between the opposing psy styles is INSIGNIFIGANT due to the vast majority of psy out there not fitting into the simple definition of 'it is this/that'.
Any redundancy issue with respect to style that an artist has is their own issue. Some people would like to refine that which they have, while others are more interested in exploration.
-n
