Well, we make them do a really hard HackerRank test, and then write syntactically correct code to print a binary tree in raster order on a whiteboard. And then we don't hire them because their salary demands are too high so we get someone cheaper with less experience.
We used to have a question for interviewers where I work: "Will this person raise the average?"
I used to detest it. I left no shortage of smartarse remarks about infinite limits in a finite world.
In fact nobody really liked that question and it was eventually removed in favour of variations on the core question: do you want to work with this person?