[traverseda]

Well IQ is an attempt to measure the mythical G (general intelligence, if there is such a thing), and more studies in that direction would allow you to better control for various factors relating to G, and figure out what interventions are best for increasing G.

I'd personally consider those other studies to be more important than race and IQ, and certainly more palatable. I think it's possible that the race/IQ factor has made that whole field untenable though.

I very much doubt it's because it's a waste of time, figuring out what interventions allow people to be smarter, to flourish, is pretty important. I'm pretty glad we got rid of lead paint, and leaded gasoline. That's a very visible and important intervention of the type that IQ research would help with.

A lot of related research goes on, but it seems like it very rarely touches directly on the subject of IQ. That being said it's understandable when any IQ researcher's research would be immediately weaponized by racists, no matter how useful it could be. Most of the examples you cite (race, education, economic background) would not be useful in-and-of them-self (at least in a just world) but would be useful to help control for those factors in other research.

[threatofrain]

General intelligence is as dubious as general AI in that performance in one domain can predict performance in other domains, and the degree to which that’s possible is attributed to general intelligence.

[JamesBarney]

General intelligence was a statistical artifact discovered from testing. It basically a theory that if you do well on a history test you'll probably do well on a math test.