Obviously they don't understand levers or mechanical advantage. Think of tightening a bolt. The the longer wrench you use the less torque you have to apply to move the bolt, Same thing with a servo the closer you are to the rotational center the higher the torque the servo can handle to hold the arm still, the farther out the harder it is to hold the arm still, it's simple. That's why we use a 1 to 2 or so mechanical advantage when we set up our airplanes. Out on the servo arm gets you more throw and less torque and less resolution. In on the flight control surface gets you more throw and less mechanical advantage.