Seems like it's just a craze with all the survival shows out there......What we call a normal hunting / utility knife, some people call a bushcraft knife.
Everyone prefers their own design to do certain things. When I think of a "bushcraft" knife, I just think of a knife that I can do everything with from skinning an animal, to cutting up wood, to preparing my supper.
Like you stated, some of us make blades for all uses too, I being one of those people. I think I have a knife for about everything imaginable.