Death Metal, Melodic Death Metal, Technical Death Metal, Metalcore, Deathcore, Power Metal, Extreme Power Metal, Progressive Metal, etc.
Because not everyone can appreciate it..
Because metal has slipped into rock. there is so many sub-categories that they try to get everything into rock, pop, country, and easy listening. it helps to broaden the audience.
metal is it's own genre and should have a separate category. go forth and die. whatever...
