either all epistemological methods are valid, or none are, or some are and some aren't. — Pseudonym
Or,
tertium datur, different epistemological methods are valid or appropriate for different fields, each one calling for the best or set of best kinds suitable to it. One doesn't use a microscope to conduct anthropology, and rightly so, least you be correctly outed as a loon. And again, as another instance of invalid and unthinking presuppositions, why is
knowledge the criteria by which philosophy is judged against? Philosophy has very rarely concerned itself with providing straightforward 'knowledge' about the world, insofar as the kind of 'knowledge' it deals with is largely second-order knowledge, knowledge of, among other things, what it means to know at all. Zizek actually puts it very nicely in one of the interviews he gives with Gyln Daly, where he speaks of the relation between science and philosophy:
"When I understood that this is not to do with megalomania, in the sense of the standard counter-attack of naive scientists, namely, 'we are dealing with hard facts, with rational hypotheses, but you philosophers you are just dreaming about the structure of everything', I then realized that philosophy is in a way more critical, more cautious even, than science. Philosophy asks even more elementary questions. For example, when a scientist approaches a certain question, the point of philosophy is not 'What is the structure of all?' but 'What are the concepts the scientist already has to presuppose in order to formulate the question?' It is simply asking about what is already there: what conceptual, and other, presuppositions already have to be there so that you can say what you are saying, so that you understand what you understand, so that you know that you are doing what you are doing." (Zizek and Daly,
Conversations with Zizek) This is what I mean, among other things, when I say that getting the question right is basically nothing other than the work of philosophy.
Or else there is the position of someone like Wendy Brown, for whom the whole point is that philosophy, or theory more generally, ought
specifically to strategically disengage us from the actuality of the world: "theory depicts a world that does not quite exist, a world that is not quite the one we inhabit. ... An interval between the actual and the theoretical is crucial insofar as theory does not simply decipher the world, but recodes it in order to reveal something of the meanings and incoherencies with which we live. This is not simply to say that political and social theory describe reality abstractly. At their best, they conjure relations and meanings that illuminate the real or that help us recognize the real, but this occurs in grammars and formulations other than those of the real." (Brown,
Walled States, Waning Sovereignty)
This similarly coincides with the view of Byung-Chul Han, for whom the appeal to 'data based science' cannot but destroy any critical gaze upon the world: "Theory in the strong sense of the word is a phenomenon of negativity. It makes a decision determining what belongs and what does not. As a mode of highly selective narration, it draws a line of distinction. On the basis of such negativity, theory is violent. Without the negativity of distinction, matters proliferate and grow promiscuously. In this respect, theory borders on the ceremonial, which separates the initiated and the uninitiated. It is mistaken to assume that the mass of positive data and information — which is assuming untold dimensions today — has made theory superfluous, that is, that comparing data can replace the use of models. ... The latter lacks the negativity of decision, which determines what is, or what must be, in the first place. Theory as negativity makes reality itself appear ever and radically different; it presents reality in another light". (Han,
The Transparency Society)
I quote these not as 'arguments from authority' but as demonstrations of perspectives - exemplary perspectives imo - that are totally, absolutely absent from your woefully anemic understanding of philosophy, its place, and its role. To put it excessively and starkly, perhaps philosophy ought to be understood as the study of non-knowledge, to all the better shed light on field of knowledge itself. These are alternate perspectives which far better capture what philosophy can and does do, rather than the violent caricatures presented in your vulgar presentation of the discipline.