yes i agree with you this statement isn't the absolute truth it represents the general direction of metal it doesn't want to be exhaustive about all the metal world personally i'd never classify a genre being based on general tendencies which sounds like prejudices to me anyway as i said many times i have to do this because this article has to be encyclopedic i'm a metallar i know the world of heavy metal and i agree with what you said i'll edit that section then thank you for your suggestions and collaboration