I think the genius behind Fire is that it requires some serious skills to keep two chords interesting. For a lot of reggae, it is about the vocals, Bob, Spear, etc. these guys can keep it interesting with the vocals, mainly the stories, and their dynamics in the way they sing.
Jerry kind of touches that with Fire, if he can remember the words, but sometimes musically they just flat out nail the song, nail that rhythm and keep it driving for 10 minutes. Not an easy thing to do.
My last band I played in is a 14 piece Afrobeat band. All the stringed instruments in Afrobeat, the bass, rhythm and tenor guitars, all play their respective lines over and over again, basically a human loop machine. The challenge is to keep that beat nailed and locked. In the end, a huge rhythmic wall is formed that can not be knocked down. Listen to some Fela Kuti and yu will hear what I am talking about. Some of those Fires that still blow me away are ones where that beat never misses. Maybe for some the musicality of two chords back and forth gets monotonous, but for me, and for the drummers August West alludes to, it is all about the power of keeping that beat.
There are only two mantras. Yum and yuk. Mine's yum.