I often observe a variation of literacy which doesn’t seem to get much discussion:- people who are notionally literate and can pass literacy tests, but for whom the objective of reading is not to actually read the words, but to “get the gist” of a paragraph. This might include skimming techniques. It has a relatively high payoff as a reading strategy, because often the gist is all you strictly need.
But when faced with a text where the precise meaning of words and their order actually matters, these people struggle a lot.
My observations are in the context of supporting non-technical people interpret semi-technical material, so there’s a confounding factor of the text discussing a relatively tricky subject matter. But I’ve seen this pattern enough, and drilled down to the resolution often enough, that I am convinced that the core issue is one of literacy and reading skill, not mastery of the subject matter. To use a technical analogy, it feels like the texts are using Real numbers but these people are only reading the nearest Integer.
I have no data but can’t help feel this is somehow related to the death of nuance in discourse.