When you use trackIR/freeTrack, and you lean back in the ka-52 pit, you can see the sides and back of the pilots head. It obscures your view and is generally annoying.
Use the widecockpit, it removes the pilot. And contrary to what the name suggests, you don't get a wider view, it just allows you to adjust the pilot's position (and removes the pilot 3D model).
BTW with the new Apache cockpit "wideview" will be the only view. Or if you prefer, a normal view where you can adjust the pilot's position.