This is either an exaggeration, or you are not using it right
While aiming with the cone you have to “select” the target (so that the borders of the central tile it is on is colored red). You will also see the damage estimate for the target at the health bar on top. This will aim the attack at the centre mass of the target. The chances to hit are actually higher, because the 50% penalty to accuracy is gone, but of course some shots will always miss except very large/clustered targets.