Yes (or:mostly, maybe). When geography teachers teach glaciation, they use (say) the Lake District as a case study. It seems to me that some teachers/resources are so keen to focus on a text (the ‘case study’) that the wider point (‘literature’) sometimes gets lost (so agreeing with the 1st reply).

But I’m not sure it’s the ‘disciplinary skill’ but more the ‘this is how literature works’ eg this is voice, character, subtext, this is how you infer, this might be one way to look at it etc (sorry, is that any clearer?)