I'll say what I said without the flaming then.
Obviously if you compare it to Sabbath, or 80s thrash it is going to seem a bit less... heavy. But that is like saying getting ran over by a pickup truck isn't harmful, because getting ran over by an eighteen wheeler will kill you. It is fallacious thinking.
Metal isn't solely about "Satan" and being "heavy"; and I firmly believe you have a fundamental misunderstanding of what metal is, if you seriously think 70s Priest is anything other than heavy metal.Still just sounds happy/Rock and rolly compared to even the first black sabbath song. Or compared to any of the early 80's thrash. Sabbath was singing about Satan with sinister vocals and tritone guitar riffs while DP and JP were playing happy upbeat rock riffs just a bit faster, and singing about cars and such.
Obviously if you compare it to Sabbath, or 80s thrash it is going to seem a bit less... heavy. But that is like saying getting ran over by a pickup truck isn't harmful, because getting ran over by an eighteen wheeler will kill you. It is fallacious thinking.