Have you ever wondered..... let me take the amazement from your needing to wonder in amazement mind of WHY just such a wheel is used in big trucks with massive power plants...
Idle quality, ever wonder what the harmonics would be like transferred thru the crank of a 2200 ft lb diesel in a straight 6 configuration with a light flywheel that has as much as 20 to 1 compression hammering down on it.... I don't think so...
Now that you know flywheels are also used to mask harmonics and make idle quality better you might not make other misconceptions and think they are gospel....
You'll also notice that is also why car companies used heavy wheels instead of light wheels, idle quality. . . .
