Politics and academia were, and can, never be independent of each other. If that were the case, why would scientists “march for science” in 2017 no less?
True, gender studies and feminism emerged out of political movements, but they do have legitimate critiques of how older forms of science and philosophy neglected or misrepresented half of the world’s population, and not to mention the sort of discrimination or biases that were a part of those discourses.
Here’s what gender studies has done: made self-analysis central to politics and intellectual pursuits (and not merely scientific; the two aren’t synonyms!); continually critiqued the most essential binary in human history, male-female, and contributed to a diversification of identities which were held in large part because of colonialism.
Gender studies isn’t a science; it’s trans-disciplinary because one cannot study the lives and experiences of subjects in a neutral manner, because that would be fundamentally unjust; it is as much a political endeavour as earth sciences today because we recognise the link between knowledge, broadly defined, and the consequences of not acting upon said knowledges.
Your arguments, unfortunately, don’t stand the test of examination.