I found some excellent photos of the Wisconsin's teak wood decking to compare;
In this one, it appears the ends of the planks are deliberately staggered, even to the point of having a 'shortie' put in to help prevent flush-ending two adjacent planks.
There is also a deliberate attempt to avoid pointed ends, with the planks given notched or stub-ended notches instead.
In this one, the framing in wood has a slope to it to lead water away from the fitting.
There appears to be air gaps between the sides of adjacent planks; wouldn't that tend to collect water and rot the wood?
Or if not, where or how does the water drain away so it doesn't just act as a natural 'sump' and retain standing water in the gaps between the planks?