I'd rather that than leet code dancing around: "It's not an IQ test, since those are bad, but this is okay though!"

My problem is it's self reported, so it ends up being a "are they smart or did they lie?" game. You can't easily verify it for anybody over 23 or so.

Canonical has a job application where you are supposed to rank yourself on a percentile (up to like 1 in 10,000) on how good you were at math in high school. It's a very easy way to incentivize lying, and also to hire people with an excessively high appraisal of themselves. There are a lot of people who are reasonably good at math, and have avoided humbling environments like the Putnam, and have convinced themselves they are God's gift to math, when in reality they were just the brightest kid in a class of 100 high school students.