Well, because it's all subjective. What works best for one guy is not tits for all. I use a 6'6" Med/Hvy and a fully spooled 4600C most often and I can slide a bait in there and wrestle a fish out with the best of them. I can also do it with A 7' heavy, and probably could pull it off just fine with a 5'6" pistol grip, but who cares? There's no need to have a special rod dedicated for shooting docks. If you WANT one, fine, but it ain't a hammer/wrench thing by any means.
What truly matters is boat positioning and the ability to get the boat positioned good without spooking the fish. Trick casting is a neat way to show-off if you are just really anxious to cast but in most cases you can position the boat so as to eliminate the chances of a blown cast and a spooked fish.
I guess it depends on whether your real goal is to catch the fish.... or impress the guy in the back with your trick casting skills.