It's a band-aid for an unfixed root cause. Solving problems by talking doesn't work for all people. It astonishes me how broken interview processes are. They just need to see if the candidate will be able to do the daily job of a current employee in that position. It's that simple. It doesn't require whiteboards, puzzles, 10 interviews. Put the candidate to work on a project that you currently facing and see his performance. Doing something other than that is bullshit.