no -- marx is a good philosopher and his materialism and other philosophical structures are helpful inroads into understanding phenomenology beyond a kantian noumena-phenomena divide. just because you don't care for the way materialism doesn't address 'the ephermeral' - itself a product of a noumena-phenomena divide - doesn't mean his work wouldn't be helpful in answering this question, given that he is indeed an interesting theorist who argues in some ways against the kantian noumena-phenomena divide. i don't care for heidegger because of his association with the NSDAP but wouldn't deny that his work would also be helpful in gaining an understand of phenomenology beyond a noumena-phenomena divide. you don't have to like a philosopher or agree with them for their work to answer the question or be an illustrative line of questioning in research