The comment to which I responded claimed that IQ tests "probably aren't legal in the US", which is false. They aren't more widely used because they don't work well for candidate selection, but they are used by very large companies that are attractive targets for employment discrimination suits, and wouldn't be if they were legally risky. There are well-known tech companies that up until a few years ago gave IQ tests to candidates!

Empirical observation trumps axiomatic derivation in this case.