It would be like adding six 50-pound weights on top of the rider's lap. Now, back to track angle. As the track angle approaches 0, the amount of track in contact with the ground increases, which means that more of the vehicle's weight is carried by the rear suspension. Weight just doesn't disappear. If more weight is on the rear, less weight is on the front.
Coupling does more than just improve ride comfort.
If designed correctly, it constrains the motion of the rear suspension, and in particular, can limit the track angle as the suspension compresses. Constraining or limiting track angle will bring the handling back to your sled by keeping the weight on the skis, which will improve directional control. Observe the thumbnail graph below. The three lines show the difference in track angle for a coupled and uncoupled Arctic Cat FasTrack Long Travel suspension. Notice that the track angle quickly approaches 0 as weight is transferred.