I'll preface this by saying I consider myself a POST-postmodernist. Most of the insights of postmodernity are correct to a point but fail in the end in performative contradictions. This does not mean we are privy to the fine mechanisms of nature or reality. We still don't know all that much! I call this epistemological​ humility.
This framing seems to me more of an academic war rather than offering valid insights into reality and the human condition.
Much of what postmodernity got right was premised on Sellars's Myth of The Given; that is to say that reality isn't simply given to us in the way we thought prior to The Enlightenment.
Where this line of thinking is correct, IMO: Critical Theory and The Frankfurt School with its Marxist Multiculturalism should not be allowed to destroy western cultures. And no, I am not an ethno-nationalist, but I do think immigration should be premised on a TWO WAY STREET! If a Saudi wants to live in Canada then the exchange should be one for one with the Canuck being given the same rights as the Saudi in Canada.
On Classical Liberal economics: it's been hijacked by oligopolies and been turned into a transnational​ plutocracy. This is not good! Having said that, Classical Economics was fine in its time but now deficient to solve the complexities of the coming century....