What’s up with the majority of 8.38 decks being longer wb?
I usually ride the 8.38 x 32.25 with the 14.5 wb, so I am guessing this is the one you are talking about.
Generally it depends on the brand, as for some like the DLX 8.38 it is the longer version, between two shorter versions so that people who want a slightly longer wheelbase on a similar size board can have that one, as they go longer / shorter / longer / shorter as they go from smaller width to wider.
A number of other brands also use that same board shape, even if their other shapes are maybe more uniform though.
The examples of this that I have skated include DLX - Antihero, Real, Krooked, There, and others like Baker, Deathwish, Birdhouse, DGK, Element, just for starters.
Then there are other brands that I know have different or shorter options in the 8.38 or 8.375 widths, some 14.38 wb including Passport, Magenta, Frog, and Generator boards.
Some even down to 14.25 such as April, Primitive, newer Element, DSM wood and more.
Then there are the DLX Tru Fit or AH Short boards in the same width, with 14" wb or so, as well as a number of other brands out there I can't think of right this minute that I have seen with other wheelbases, eg Palace 8.38 with a crazy long 14.8 wb or something like that.
Did you have a particular wheelbase you would prefer?