@Maddus Mattus:There are always some fundamentals they ought to remember.
For example, it a programmer can't even remember basic syntax, imagine how much time they should spend on referencing books when coding.
There's also lots of fundamental equations / laws on Mathematics or other subjects. If you can't remember them, while it's true that you can always find them from books, you're doomed to be an underperfomer.
That said, some subjects (most in civil engineering discipline) are changing to "openbook exam" now. The new tests are more difficult because you can no longer gain points by reciting paragraphs (and it is good).