well, i am not a "fan" of those disciplines, i just have to work with them from time to time and i understand your critique. On the other hand i would say it would be quite irritating if we give up to study humans exept for their cognition, aka seeing them as machines and how they work on a technical level, aka neuroscience. A world where we are only interested in that would scare me personally.
I had to take off-tours into various other disciplines while i studied, including 1 course each in linguistics, philosophy and yes, Gender Studies.
I actually found philosophy the most useful thing actually as it dealt with general questions about knowledge, but heavily drawing on logic. Philosophy felt more like a craft.
Linguistics, well, i forgot most what we did.
Gender Studies was the weirdest one, because we did something none of us expected. We actually applied methodical critique to said studies done by other disciplines that were dealing with gender themselves and found that many of them were pretty useless, simply because they were quite full of fallacies, their sample size was too limited (10 people is laughable) etc etc. So we actually had to scap most stuff that was done by other disciplines about gender...
Later i was working in the field of neurocognitive musicology were we ran into the problem of experiments not being reproducible. Not just one or two. More like 80% of them. They simply didn`t produce the same results.
So, what do i do now? Do i stop to think about humans or simply accept that noone is interested ENOUGH to fund those fields? Robots are cool. Star Trek is cool. So people have a very high tolerance for very high amounts of funding for technical stuff. Meanwhile, there is equal to zero funding for psychologic experiments, research in humanities etc.
Thats why there is not enough data in those fields.