Strange Darryl, but I had always considerd that you were intelligent enough to understand the fundamental mechanics of sail boat racing..
You say it's not important to have boats at min weight in a "box rule" class, Well then why is it so important for the F18 class to measure each boat and add corretors to bring boats to a min weight? F18 is as much a box rule as F16 is and the min weight rule is enforced with great strictness. Are you saying that these efforts are misguided?
Answer this for me:-
There are two identical Blade F16's rigged on the beach and its the first day of the GC, one boat is on min weight, the other is 7kg overweight.
Which one would you choose to race the event on?
As for crew weight:-
I am sure that as/if F16 matures an optimum crew weight range will emerge, however you need to be careful not to put boat weight and crew weight in the one equation. moveable ballast is markedly different to boat weight.