....
Do the calculations for motion comfort have any worth seeing as how
they don't seem to take hull design shape into consideration?
Or is this calculation only good to compare similar hulls. ...

The basic premise of most comfort numbers is that boats with narrow
water planes are more comfortable than those with wide ones. All else
being equal (ha, ha), this is probably true, but I don't think the
differences are profound. Generally, comfort ratios are put forth by
folks who want to suggest that cruising boats should be narrow and, by
today's standards, heavy. It turns out that, as a class, multi-hulls
with their very narrow water planes tend to have good comfort ratios.
I'm a big fan of multihulls, so I get a kick out of this result.
However, I'd say that comfort rations are pretty much total garbage
because they ignore the dynamic nature of comfort. The trick to
getting a comfortable motion out of a small sail boat at sea is to go
slowly while carrying a good press of sail while avoiding sailing deep
down wind. Virtually all boats are comfortable when hove to with
enough sail up to keep them from rolling. As you let the boat head
reach it will get less comfortable as the speed increases. The
primary, indeed, as far as I can tell, only significant comfort factor
is speed as long as roll is controlled by keeping enough sail on.
So, if you have a slow boat it will tend to be comfortable because it
can only operate at comfortable speeds.

Folks with faster boats will notice that some speeds are more
comfortable than others. The reasons for this doubtlessly have
something to do with water plane loadings, pitching moments, reserve
buoyancy, wave periods and so forth. I'm sure a good naval engineer
could predict what speeds would give the best comfort to speed ratios
given enough time and a clear definition of comfort. However, the
problem is hard and I am extremely skeptical that a simple ratio will
be of much practical use. Also, the amount of comfort a crew will
demand may well depend on many factors (like the time to a hot shower
or the desire to win yet another silver plated punch bowl). In short,
no I don't think comfort calculations have any worth either for similar
or different hull types.

-- Tom.