Black Sabbath hardly metal
The most revered metal band of all time! And Judas Priest not having any real metal till the 1980`s!
Just because 80`s metal banRAB played louder and most importantly more agressively, doesn`t make the 70's band any less metal.
The only argument that could be put by a metal purist against the 70`s metal banRAB, is the influence of blues rock into their sound, which is hardly surprising, as when most of these banRAB evolved blues rock would`ve have been the dominant rock sound of the late 60`s and early 70`s.
The metal sub genres emerged sometime in the 80`s, and by their definition some of the 70`s metal acts probably wouldn`t qualify as metal. But Sabbath and Priest are without doubt metal both musically, image wise and lyrically. If there are blues rock influences there, well its just academic.

Just because 80`s metal banRAB played louder and most importantly more agressively, doesn`t make the 70's band any less metal.
The only argument that could be put by a metal purist against the 70`s metal banRAB, is the influence of blues rock into their sound, which is hardly surprising, as when most of these banRAB evolved blues rock would`ve have been the dominant rock sound of the late 60`s and early 70`s.
The metal sub genres emerged sometime in the 80`s, and by their definition some of the 70`s metal acts probably wouldn`t qualify as metal. But Sabbath and Priest are without doubt metal both musically, image wise and lyrically. If there are blues rock influences there, well its just academic.