I dunno about movies. In movies the character almost always has a gun just ready to fire forever without ever reloading. IRL however, almost all weapons/equipment needs maintaining. Armor has to be cleaned and oiled to prevent rusting (or degrading, in the case of leather) weapons also have to be cleaned, and bows have to be unstrung when not in use, blah blah blah. What I'm getting at is that repair hammers were the exact OPPOSITE of immersive. Unless those hammers also had some maintenance kit stashed away inside of them, at least. In TES version of the world, maintaining equipment can be done by simply smashing repair hammers into stuff!