I'm not sure what happens when I use a heat gun can properly be called "control." I mean, sure, I'm voluntarily and somewhat deliberately stirring the beans, varying the distance, switching from low to high or vice versa. But when I go back to the gas grill and drum, I can hold those things constant, better than I can with the bowl, and in general I can apply a more stable sort of control to the system. And I have a thermometer in there, so I can stabilize the effective roasting temperature, not just the inputs. To me, that's more control.