Somehow I think that is a critical statement re: full keelers performance.
How many of them have Sa/D ratios over 15 or so? I would venture "not many" and that short sail is the real cause of their rep for being slow in light air, or at least as much to blame as the wetted surface.
I met a guy once who had a hot rodded '65 Chevy Impala that would run the 1/4 mile in the 10 second range. That aircraft carrier was the automotive equivalent of a full keel but it had the "sail area" to make up for it.
Yes, and many people who sail these boats don't have the sails to make the boat move like it can. I prefer the heavier boat even if it means greater sail area than a lighter boat of similar length, because I like the way the heavier boat sails. Its a personal preference as others have stated in this thread.
Some make the assumption that, because they once sailed past a heavy full keeled boat "with all working sails flying" etc ad nauseum, that these boats are pigs.