What makes you say that we're 'behind' the choo-choo boys? For one, even the best DCC sound loco doesn't sound very good due to the small tinny speakers they have to use. For another, we have a lot fewer sounds than all the whistles, bells, spitter valves, air compressors, rod clanks and such that are 'needed' for a loco.
There's nothing stopping you from using truck sound modules for models of small boats as many of them are powered by truck engines. I have a Detroit Diesel power-pack sound in one of my tugboats. Really big vessels don't produce the kind of engine sound you get from a small boat.