For example my wife is finishing her PhD in history, specifically medieval art. Granted it is a PhD and not undergrad, she has had to master many things else she would be, as you said, fucked. I remember once she was told to learn German the next semester - not like take a class, but learn German to read old-ass academic and literature text. I am a scientist and I know there is no way I could learn a foreign language like that. She reads through medieval Latin text; that was a skill that if she didn't master she would fall behind.
Again, this is my wife's situation and it is all I know besides my own experiences. However, to simply say if you don't study STEM programs then you don't need to build on fundamentals is just simply a naive thing to say. And, ironically, a not very scientifically-minded statement.