The point is, they should not actually require candidates to recall these things from memory. But there is certainly value in the non-memorization part of this

The point is, they should not actually require candidates to recall these things from memory. But there is certainly value in the non-memorization part of this knowledge and the ability to solve this kind of problems distinguish people who can think from those naive jobsworths. If nothing, they are better than back-of-the-newspaper if-you-have-seen-the-answer-you-know-the-answer kind of trick questions.