@John:
two reasons

1. functional
the SC20 has a nosediving tendency which is reflected in the fact that the boat nowadays only exist in a 2 feet longer version (ARC22). I think I don't have to raise the benefits of more volume in the bow, specially when its increasing the waterline length... as intended. curently the boat also generates quite some spray, something I relate to that the lines have quite some radius in the bow section, which also would become smoother if extended.