D856C, i understand the point you are making and agree with you on the overall, however, fitt's law is only a piece of the puzzle.
good color choice, sufficiently weighted content, and balanced page layout also contribute just as much to usability as proportions and formula do.
it's best to keep this in context as a tool to be used along with others for the best result rather than a guiding philosophy or cure-all usability method.
i personally find mezzoblue hard to navigate and their layout causes confusion as to what is the more important information. not due to the use of fitt's law but typography choices and coloration of key sections.
i've seen similar abuse with the golden ratio when implemented in design forcibly.
good design uses tricks, methods, intuition, and random color.
great design is balance.
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