Heavily distorted fast thrashy riffs and chugging palm-muted riffs aren't metal? I did not get this memo. Also, not that this is great proof or the supreme source, the most scrutinizing archive of metal bands disagrees with you.
So fucking what I could careless.
There is no thrashy riffs and know how many rock bands have heavy distorted guitars and even palm mute.
go clean or something. good god