DISCLAIMER: This is no PEDALS vs. AMPS post. Read on.
I just wonder sometimes, why did all these high gain amps appear just so recently? Way before the nu-metal scene there was so much demand for high gain. Of course, the '70s metal folks were very much deprived of the chuggah-chuggah chunk because all the amps then were somewhat low-gain. Came the '80s and early '90s you already have the mid gain amps - think Marshall 2203. But now, we already have amps that deliver insanely too much gain.
But thinking about killer metal tones, I seemed to like the boosted mid-gain tones in early '90s and late '80s metal. They would usually run a DS1, SD1, TS9, etc in front of some Marshall JCM800 or similar. Sepultura did this extensively. So now, what do you think is the advantage of depending on your amp mainly for high gain sounds versus sticking a boost pedal in front of a mid-gain amp?