I find it funny when people talk about how newschool goa has "a few good exceptions" when one could say the same about old goa, although I do admit the ratio has changed. Also claiming there has been no evolution is either an outright lack of sensory perception or a sad misunderstanding of the term. I'd say, there was and still is a bunch of bad and/or average goa, however the difference in technological capabilities of higher processing power and better softwares has resulted in various changes and ushered the evolution of the genre's sound.