Yeah, I feel like in the OT stormtroopers are just regular soldiers and there’s nothing elite about them. They certainly can’t shoot very well and die in droves.
Certainly there’s some aspect of marketing to it considering we saw in Star Wars that regular stormtroopers are modular and can be outfitted to work in other environments, but we also know that in-universe there are specialized armors for snowtroopers and scout troopers, plus TIE fighter pilots and AT-AT pilots and AT-ST pilots so it’s not a big stretch to imagine that there would be specialized armor for tank drivers and and other roles.
The shoretrooper thing better have certain specializations that a normal stormtrooper doesn’t have though.
A shoretrooper could just be something similar to a scout trooper. Doesn’t have to be anything fancy about them.