flapabreaker-
The non-skid on the topside decks is not real soft and rubbery, just somewhat softer and with the diamond pattern finish to increase adhesion. The fact that your boat has different absorbtion properties in the diamond patterened areas indicates that there is non-skid there.
Why is it the same color as the hull?
Your boat has a medium grey accent stripe. Since the grey is neutral (not red, green, yellow, blue, etc), the non-skid has to be neutral as well, as a real color would not fit with the grey. Thus your non-skid has to be either a lighter grey or the hull color to be a good, workable, and compatible color with the basic off white hull color and grey trim. This is according to standard art and interior/exterior design color theory.
I'm guessing that the factory has tried the different combinations possible over the years, and made yours with the non-skid the same as the basic hull color. If you think about it for awhile, you will probably come to the conclusion that they made the best choice possible.
My $0.02 guess!
Joe.