Some people see it as not worth and too boring to understand and actually solve it.
I had a few friends of mine that I used to teach in our course work. For some of the fundamental classes for stem (e.g. Probability and Stats), even though I tried to show him a way to arrive at the solutions, he tried to ask directly for the solutions instead of arriving at them by himself.
The same thing was true for probably me when I was studying geography and history in my high school years since they were taught largely by a collection of trivia knowledge that I did not find interesting. I would have used chatgpt and be done rather than studying them. But, when I took the courses that covered the same topics in history in my university, it was more enjoyable because the main instructor was covering the topic to tell a story in a more engaging manner (e.g. he was imitating some of the historical figures, it was very funny :))