Because that's the way they do it.[&:] Plus, probably more efficient in manufacturing. When you get into modules and all that it's more drilling for screws and all that. Probably cost about the same to make a cam without modulesas it does to make a module. Make the came draw length specific and you've built in optimum performance without all the hassle. Bows that have different screws like a
Darton to shift the cam are not as efficient in some holes. Well maybe they're efficient, but you have a different feel during the draw.