I understand the criticism of most of Postmodernism, because they reject Marx historical materialism, because a part of it is new-age trash and unactionable, and its authors were grandiloquent, pretentious shit (even the one i like the most, Baudrillard, seems to be an insufferable human being), but the simple act of rejecting meta-narratives is such an interesting idea, it posit that all action (or social struggle) as necessarily local, limited, and partial, but nonetheless effective. A moto of postmodernism would be "act locally, and don't worry about any grand plan, even if those exist, they won't work".