Good topic.
My two cents (probably a penny short):
As technology changes the culture and understanding of music has changed with it creating sounds we never expected in previous generations. The problem here is that what was once a rebellious and aggressive art form, metal is now a exponent of 'traditional' instruments. For traditional music the instruments all have their part to play and the music maker, producer and consumer have clearly defined and understood expectations and parameters that these instruments should meet. Hence why Sneap is selling the actual instrument tones, to reinforce the tradition.
But, metal needs to stay sharp, aggressive and relevant today to fill the quota of 'rebellion'. Unfortunately it has does this through numerous 'cut your noise off to spite your own face' type exercises. The music maker, producer and even consumer are all slightly tired of it, its reached a plateau of expression and so after we're saturated with the metal image and tattoo's, long hair and ggrrrrrrr (what?) there's only one chance to re-invent rebellion, that's by mocking the tradition (which shows the lack of ambition in the plateau).
I always thought that metal, punk and grunge where always about fighting against established forms of thought, yet its now compounding them to suit its own aesthetic.
...but whatever right? rant off.