BF, that Fastnet was in '79, and it's a fascinating story. Many abandonded boats were later found afloat, lending credence to your "sailors fail before boats" theory.
RG, I agree that such a scoring system is not going to provide a equalized rating that can be taken on its own. There are too many variables (and subjective views) for a universal code to determine a vessel's appropriateness for whatever purpose is intended.
And, as Giu points out, no matter how "idiot proof" someone may make a boat and its systems, somewhere, somehow a "better" class of idiot will turn up.