Well there's a double edged sword there with not panning some of your precussive elements.

I can understand not panning the bass, subs, kicks and snares because they're the main body of your sound. You want the centered, heavy, punchy and tight sound to your main elementsm, from the mids to the lows.

But the brighter (read: high) areas of your sound, the claps, hi-hats, cymbals and more elborate precussive elements (bongos, woodblock, cowbell, farty noise, whatever) might benefit from a wider stereo field. Keeps the drums interesting and makes the mix as a whole seem wider, and gives it more body. Don't go to nuts with the panning, but just a tick to the left or a tick to the right can make all the difference between a muddy, cluttered top end and a barrage of high end precussion that dances and gives precussive groove to your centered and punchy low end.