I can really certify that this was my lived experience. In the math degree course, basically everyone who was not incredibly passionate about mathematics (NB: "passionate" does not necessary imply "great academic achievements") changed their major or decided for a different kind of tertiary education.
Former co-students who attended the same university and degree course had the same experience.
I guess the reason was that it was a decent university in a "boring" town where learning for your studies was one of the more exciting things that you could do.
That said I generally think the take that it's somehow privileged to find school interesting to be sad. Over the last couple decades one could do pretty well with pretty much any STEM degree. Is the majority feeling among people studying engineering that they just have no interest in any facet of how the world around them works? They have no desire to understand how to create (and alter to their liking) the things they see? No interest in the fundamentals of how the universe works? How different materials come to act the way they do? How living beings work? Nothing?