The job nobody wants usually teaches the lessons nobody else gets.

Unwanted work tends to be unwanted because it is tedious or unglamorous, not because there is nothing in it. Those roles often sit where you can see how the whole operation actually functions, which the more desirable positions never show you. Fewer people take them, so fewer people have that view. Difficulty and value get confused with prestige constantly.

Volunteer for the task everyone avoids on the next group thing and pay attention while you do it. Ask who depends on this and what happens when it fails. You end up understanding something about how the place runs that nobody else bothered to learn.