Shooting with a camera is much like shooting for accuracy with a rifle. A rifle creates recoil. In an accuracy situation you want to minimize recoil,"and how do you do that? With weight. Mercury tubes, muzzle breaks, muzzle weights, weighted tuners and whatnot.
Yeah, but you're not going to want to lug all that crap with you in the field when hunting......
To continue the parallel, From a bench for accuracy, I use an 18lb rifle. My field rifle (for hunting, kind of like shooting wildlife with a camera) weighs less than half that. Stuff gets heavy quick when you have to carry it around. Even stuff that would otherwise seem light.
The right tool for one job isn't always the right tool for another.