Good article.
I always thought that calculation of motion comfort derived from just a few numbers can not give a realistic number - Site like
http://www.image-ination.com/sailcalc.html just use Ted Brewer's formula and lot of contributing factors are ignored.
A small boat with higher motion comfort may be in some conditions very wet and miserable while a larger boat with lower rating may still be dry and easy in the cockpit (not in the V berth in front cabin).