 In thus appealing to the “principle of testability” as the supreme methodological maxim, Feyerabend forgets that testability must be traded-off against other theoretical virtues. Only his pathological fear of theories losing their empirical content and becoming myths leads him to want to maximise testability and embrace an absolutely unrestricted principle of proliferation. He also disregards historical evidence that anti-realist approaches can be just as pluralistic as realism.