Its handy to have the drummer option to turn on/off to get an idea going. And its helpful to be able to put a loop into a MASTER loop slot. But it would also be cool just to be able to keep a collection of - say 10 favourite loops of ones' own and select one of those as the "Drummer" instead of the MIDI drummer.
Useful if one needs an alternate type of fee, ambient etc.... But doesnt want to go thru the hassle of importing a loop into the a master slot