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!