I think it does divide things too much.
but it`s the nature of life today
We are so spoiled we expect exactly what we want, what works for us now, and we want it again and again and again.
Burroughs wrote a very interesting essay on the dreary predictablility of human behaviour when it comes to pleasure.

People seem to focus in on the one tiny thing they like, and just stick with it, as a whole.
With more choice, society seems to get more narrow minded and self centred, and this is reflected in music.

Techno DJ`s playing an entire night of skkkkrannzzzzz or mnmnmnmllll
or whatever.

And people that go to a mnmnmnnmllll night only going to nights that are minimllmlmn, not going to somewhere else to try toher things.

I think it`s something that goes deeper than just music.

It`s more to do with us spoiled, stinking, westerners.