There's actually two types of control surface balancing.

The first and most usual is the mass balance where weights are placed ahead of the hinge line in some manner to balance the weight of the control surface. This moving of the control surface balance point towards the hinge line is usually related to reducing flutter tendency.

Then there is aerodynamic balancing. This is where there is a large portion of the control surface ahead of the hinge line so that the aerodynamic forces can reduce the loads required to move the surface. This is often seen on full sized aircraft and on some of our modlels. For example lots of fun fly designs have the rudders or elevators "turn the corner" at the tips of the surfaces so they have tip ears that extend to the leading edges. A few years back it was common to see this on model sailplanes.

For the most part our model servos have more than enough power to move the surfaces against the air loads related to the speeds we fly at. And one disadvantage of the balancing ears at the tips is that they stall almost immediatley and actually have LESS control effect than if the stab and elevator just had a simple hinge line so the whole surface could act as a proper variable camber surface.

On a fun fly it's not a big deal as there is MORE than enough power to go around. On the older sailplanes it was often found that modifying the design to eliminate the balance ear by joining it to the fin the rudder response was enhanced and less drag was also noticed.