If one were to fault a philosopher for not being able to generate something basic in that sense, I’d think one would also have to fault physicists for not yet having generated a Theory of Everything. A generalized theory of knowledge would be fundamental within philosophy, but that doesn’t equate to being easy to generate, or impossible to work without (if it were, after all, nobody else ought to be able to get any work done without it either.)
If one were to fault a philosopher for not being able to generate something basic in that sense, I’d think one would also have to fault physicists for not yet having generated a Theory of Everything. A generalized theory of knowledge would be fundamental within philosophy, but that doesn’t equate to being easy to generate, or impossible to work without (if it were, after all, nobody else ought to be able to get any work done without it either.)