It's frustrating how common IQ based things are still. For example, I'm autistic, and getting any kind of support as an autistic adult has been a nightmare. In my particular area, some of the services I've been referred to will immediately bounce my referral because they're services for people with "Learning Disabilities", and they often have an IQ limit of 70, i.e. if your IQ is greater than 70, they won't help you.

My problem here isn't that there exists specific services for people with Learning disabilities, because I recognise that someone with Down syndrome is going to have pretty different support needs to me. What does ick me out is the way that IQ is used as a boundary condition as if it hasn't been thoroughly debunked for years now.

I recently read "The Tyranny of Metrics" and whilst I don't recall of it specifically delves into IQ, it's definitely the same shape problem: people like to pin things down and quantify them, especially complex variables like intelligence. Then we are so desperate to quantify things that we succumb to Goodhart's law (whenever a metric is used as a target, it will cease to be a good metric), condemning what was already an imperfect metric to become utterly useless and divorced from the system it was originally attempting to model or measure. When IQ was created, it wasn't nearly as bad as it was. It has been made worse by years of bigots seeking validation, because it turns out that science is far from objective and is fairly easy to commandeer to do the work of bigots (and I say this as a scientist.)