There are so many natural dualities of sense, such as subject and object, consciousness and experience, awareness and consciousness, noesis and noema, for-itself and in-itself, appearance and reality, phenomenon and noumenon, will and representation etc. Each has its own distinctive virtue and flavour and each falls victim to a kind of dissolution of the binary wherein the dividing line is lost or reappears inside one or both of the poles. That is not as important as the possibility of sharpening the distinction as far as possible. You only draw the distinction from a certain range of possible experience but without knowing the full range of possibilities of experience. Or say you start from awareness and consciousness: what is the most extreme form of awareness? That you are barely entitled to use the word is not because it is conceptually fuzzy but because you do not know its absolute form.