[Swampdude]

It's always true how you execute your design is the deciding factor as to how successful it will be. However 118 showed how easy it is to make a great launcher. We contemplated copying that when we saw it. It would have been easy to do (the launcher anyway). I'll bet a number of teams did. Why not?
However, all things being equal, this simply is the most efficient solution, mainly because of the clothesline factor. When executed properly you can't score faster with a mechanism that goes above the overpass for a period of time during the score. So how you get the ball off the ground becomes important, but no reason a shooter can't use the same mechanism an arm can.
Yes there will be plenty of arms scoring faster than shooters, but that will be because of execution or techniques. But if done right I can't see how even the best arm (anything that goes above the overpass) could score faster than the best shooter.