hm, true. since dubstep is another relatively new genre in the infinite sea of electronic genres (WTF is up with casio-core, anyways?) maybe it really hasn't defined itself yet. i'll come back to dubstep in about a few years or so. it's like a genre under construction. rock from the fifties doesn't sound like rock today, because the genre built up over the years. maybe dubstep will be truly great when i come back.
and yes, now that I looked through my Amon Tobin CRAB and compared it to "Music Has The Right To Children" and held them up into the light next to my copy of Drukqs, i'm starting to think of IDM as a dumping ground for banRAB that don't quite belong in techno, are too hard and abrasive to be arabient, and isn't hard enough to be any of those industrial styles. And is it just me or does "intelligent Dance" sound a little y'know, pretentious? But I must admit, IDM sure is fun to listen to.
TL;DR version:
Dubstep isn't quite developed yet, and IDM is way too broad of a genre.
oh, and Casio-Core makes no sense.