But you can do the same thing with the possibility of someone obtaining a Stone Sword from corn.
There are only two maps that could really abuse this feature, and they both wouldn't have much merit...these two maps being Moonlight Lake and Breeze Island.
Breeze - you swim to cornucopia, obtain a boat, have to travel back and place the boat, by then most people would be close enough to be out of the cornucopia and onto their "chest routes", but you have to swim all the way back and craft the weapon. Most people would be on their chest routes by then, and probably stronger than you are...and since it's Breeze Island, I don't think most players would want to risk breaking their boats.
Moonlight Lake - ^read above. Most people would be finished with the lily parkour, and onto their chest routes. (you cannot break boats on lilypads, from my latest experiences)