Yeah, that makes sense. In science at least, you aren't doing anything new in undergrad. Anything you say has to come straight out of someone else's work, because you aren't actually doing any! If I, as an undergrad, say something about genetics that I haven't gotten from someone else's paper, what reason do I have for thinking it's true? I haven't done any genetics research so it's effectively a guess. You are still expected to apply the knowledge you get from your sources to the topic at hand, but you just aren't in a position to say anything too novel. It's one of the reasons I suspect STEM degrees are probably on average easier than arts degrees tbh.