There are many other actually useful studies for that. Math excels in that.

(goes back to No Child)

In the US, that shit goes back at least to the GI Bill post-WW2 and the Cold War STEM obsession that took root after the Soviets launched Sputnick. For better or worse, and to be clear a very real portion of it was for worse, before that time College or University was a finishing school, hopefully to include intellectual development, for future elites. Well-read, well-rounded and well-spoken were the expectation, and it was a ticket to opportunities.

After the war, we simply adapted the existing educational infrastructure to a vastly expanded audience who were now told that some degree was the ticket to any promising white-collar career; teachers colleges, technical colleges, and completely new institutions all moved to a model based on the prominent pre-war universities, but with very different "customers". The students were there to get a professional credential, not to secure social cachet. The democratization of higher education was very real, but the number of people who needed to be college graduates far outstripped the number who wanted to think deeply about literature, history, and philosophy (or at least the number of people who understood that pretending to do so was part of the social contract).

Then, to make sure we didn't fall behind the Commies, as many resources, financial and social, as possible were poured into STEM programs. This was again within this same "University" paradigm, so students who had no particular desire to study history or philosophy were being required to do so, but 95%+ of the institutional and cultural signals they got told them this was busy work required by ivory towered non-entities who didn't do anything "real."

The humanities professors and department chairs see all this too, so they take steps to avoid making waves and keep their jobs, and keep their departments as healthy as possible. Undergraduate coursework, both the assignments and the expectations, gets watered down, especially for GenEd required courses. There's genuine stuff to unpack as to why, how, and how much STEM kids and jobseeking kids should be required to study the humanities after high school (Peter Thiel comes to mind as someone who maaaaybe should have avoided college level philosophy courses), but the particular way it went down in the US was not very healthy. Ironically, in fighting to preserve the vestiges of a liberal-arts education, its defenders may have undercut its perception.