I doubt this viewpoint is out of fashion. The problem is that it is hard to compare people from different environments if you use knowledge that depends on the environment...
Yes, at that point people who have already developed certain mindware have an advantage, but arguably that's the point of an IQ test. You're not testing the potential of a person to eventually be really smart, you're testing for the current problem-solving potential.
That being said, you're right that it would still be useful for measuring problem solving potential, but that's explicitly not what IQ tests are supposed to measure.
I personally think it's not something that's really true, but it's how I learned it in university and seems to be the default position of experts in the field.
This is of course assuming no traumatic brain injuries or the use of psychoactive substances.
Back in the day, I did a boat-load of tests and passed a boat-load of exams at school and then university. I have a drawer full of certificates from (apparently) respected institutions to prove it.
None of which are any use to me right now.
I can't say that any of the tests or exams I sat actually assessed anything close to my "innate capacity to learn".
Q: Is this just me?
Just like Google's tests do now.
Check out the history (1971) of Larry P. and California's use of IQ testing in schools.
> As a group, African Americans across the country scored lower on IQ tests. The lawsuit alleged that was because the tests were biased toward Eurocentric culture. Questions like, ”Who wrote Romeo and Juliet,” they argued, didn’t assess a student’s innate capacity to learn. It tested knowledge that some – and not others — had acquired at home or school.
https://www.kqed.org/news/11781032/a-landmark-lawsuit-aimed-...
and from Radiolab:
> What is the color of rubies?
> Kaufman argued “Uh that question is clearly biased.” I mean, the correct answer on the test is rubies are red but A...
> If your family has more money, you were more likely to know what was a ruby was
> And B, Kaufman says, Ruby was a popular name in the Black community. So certain kids might think the question was referring to people, not gems.
https://www.wnycstudios.org/podcasts/radiolab/articles/g-pro...
and in general, further reading: https://en.wikipedia.org/wiki/Intelligence_and_public_policy...
edit: add year to Larry P.