> But it's undeniable that the discursive roots of modern psychology come from Freud in particular, and that when we analyze a phenomenon ("treatment" notwithstanding) we owe ourselves due diligence to understand it properly.

Sure, and people analyzing the "discursive roots of modern psychology" - historians of science - do talk about Freud. And Wundt, and James, and Watson, all of whom are of comparable significance in the history of the field. But scientists are not historians; they're interested in analyzing the actual thing out there in the world, not the way we talk about it.