These "numbers " tell a story of one sort but it's far from the entire story isn't it? My little bit of experience includes an understanding of wieght carrying ability, just as others have mentioned, and particularly medium and heavy
displacement the role that weight carrying played in the original design. My
Columbia Challenger raced/sailed better with more weight than I would have expected... the shallow
keel dropped lower and dug in much better. The bouyancy of the
hull shape came into play more thoroughly.
The distribution of weight of supplies etc. low inside the
hull is part of a design scheme and in my Dreadnought helps provide an easier motion. This is not so true of many lighter designs.
Doesn't pay much to get
lost in the "numbers". Sailboats are living things and plenty of these two designs have made plenty of great passages. Let's not forget the sailor!