Bradley noticed that there's no difference between old Metallica and new Metallica.
Well, I wanna jump in there. Because there is. The St. Anger album consisted of Thrash Metal, which they didn't make before or after.
Different.
We separate those genres. How many damn sub-genres does Heavy Metal have that sound so much like each other, but still have a little distinguishable difference? Yea, a lot.
House and Trance have craploads of sub-genres too, and some sound very similar too, but yet they still have a difference.
Dubstep is more different than Brostep, compared to the difference between some Heavy Metal, House and Trance sub-genres.
So what are we whining about? If the two were separated, think about it, this discussion wasn't necessary. People who like Brostep would leave Dubstep alone, and people who like Dubstep would leave Brostep alone. Peace for all.