What, that bass should not just follow the guitars like a chained puppy? Why do you think Watchtower, Black Sabbath, and Iron Maiden are reknowned for their bass playing? Because the bassists actually do something other than make low frequency noises. The guitars already provide a good low end with the riffs, the bass needs to break away from the riffs at least occasionally and add something rhythmically and harmonically to the music that the guitars do not. The bass in many metal bands is redundant--for instance, Arcturus' Constellation EP was recorded without bass guitar and the arrangements do not really sound significantly worse for it, compared to the versions on Aspera Hiems Symfonia.