In the NY Times review "Four Decades of Music the redefined Free" there are numerous references to the blending or infusion of jazz into "new" music. Again, the sentiment that jazz, one of the great musical gifts the US has given the world, is making an impact.
Maybe the key to America is it is "the land of the free" and this attitude has embedded into every aspect of our thinking - to the point that when we think about music it is free(r) to associate and incorporate various styles to create something new. This isn't to say what is happening at IRCOM or Darmstadt isn't new or creative - just in a vastly different direction. And maybe what I'm resonating with are my American roots.
...because this incorporation of jazz into something still resembling something melodic is more in tune with my own tastes.