Heck, I totally forgot about another one of the big reasons I play with the ricasso width-
It depends on how you want the blade centered in relation to the handle, and still maintain visual appeal/balance. If you have a cut out choil with a dropped edge, and center
the ricasso with the handle, then the blade as a whole will be centered lower than the handle. This brings up interesting possibilities with what you can do at the point- center it with the blade but slightly below center of the handle, or use a slightly upswept tip with more belly, and still have the point centered in line with the handle.
With the wide ricasso on the Woodhead piece,
the entire blade is centered with the handle. Even if the point ends up in the same relative position as above, the mass distribution will be different, lending to a different feel in use. Even though the handle of my big bowie is symmetrical, I can close my eyes and tell which side is the main edge, since it's heavier. I'd expect the Woodhead examples to feel more neutral. (I'll have to check next time I get to handle them.)
But then again, you can go another direction yet, by centering the blade but not the ricasso, as in the nice repro dogbone bowie from Mr. Dean.