I do not understand what you would expect from research work. Do you expect that research work in mathematics be written in such a way that any lay person could understand it? Or computer science? Physics? Biology? I would assume that the answer is no. Why then do you place this expectation on research in the humanities?
I am now going to speculate, though if this isn't your reason, I apologize. Perhaps it is because you, or others, think that the humanities are not complex enough to require such rigor, and that the presence of jargon is a mark of fake rigor, not real rigor. Is that correct?
You also say: "It also tends to deal with subjects that are not of interest to 90%+ of the public." Is any research? In any field? Looking at the remaining unsolved Millennium Problems in mathematics, do you think that the general public has any interest in the "Birch and Swinnerton-Dyer conjecture?" Whatever that is? I don't. I don't know what that means. I'm sure it's quite interesting if you do.
I do not believe that your point is correct.