not block quote the whole thing but to respond to all of it
i live for riffs (a rave stab is basically a riff when it comes down to it)
I've heard you say this before and it isn't, in that sense
the intent is different, the kinesthetic sense is different, the drugs are different
I do know you're on extended record as a fan of 70s hard rock and I don't disagree that "something else had to happen", and of course it did
but there's a point where you - both literally and as a synecdoche for dissensus generally - get off the heavy guitars train, unless they're of a particular (artsy) type
hardcore punk and all that follows has almost nothing to do with the blues - it is punk (which did have blues - it's sped-up Chuck Berry riffs) stripped of blues, as well as groove, etc
I'm not really trying to get into the weeds on blues or blues-rock anyway
the true innovation of hardcore, beyond speed and the intensity of its teenage idiot energy, is liberating composition via the power chord
this also happened in metal which took it one step further via (like Schoenberg) the chromatic scale
Morbid Angel is essentially a more extreme Slayer who were essentially but more extreme Judas Priest, but also
besides faster, more distortion, whatever, there's a fundamental shift from melody to atonality