The point of trebuchets is the cows. One or two cows directly in the path of the enemy army will do more damage to morale than a cannon or ballista will, and thanks to the huge are of effect the hideous accuracy doesn't matter. Any kills it manages to get with normal ammo once the cows are gone is a bonus.
I'd say that purely thanks to the stinky cows, the trebuchet is the only siege weapon that is worth the unit slot on the battlefield, outside of specialist roles such as skewering elephants (wherein the ballista is really just a poor substitute for javelins).
Plus, biodegradable ammunition.Can't get much more non-polluting than that.
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