Narurally. I think it's widely recognized that social commentary is what distinguishes science fiction (which casts a lens on possible futures extrapolated from our present) from fantasy (escapism, mythology, or hedonism).
well, the first line of the linked page says these are "comic fantasy" and "high fantasy" respectively, so no (though I think Discworld is arguably sci fi). But I get your point and concede that genre boundaries are not solid but more like intersecting clouds.