They don't yet know how complicated their intended field of study is.
Few do. The keepers are the ones who, at first, say "The easy one," and then come to you later, cap in hand, to solicit the real answer. The joy of your profession is watching these youngsters immerse themselves in the reality.
A friend of mine sent me a link to an auction of 4,192 words of erasable core memory used on one of the Gemini flights. The bids are expected to finish around $2,000. I'm looking at my bank account and credit lines. And I owe it all to my professors and original professional mentors, all of whom worked on those projects.