which is basically how quickly you can learn

Not even that! IQ measures how well one performs in a barrage of simple abstract tasks. That alone can never be the stuff of intelligence, let alone learning speed. It doesn’t hold a candle past grade four and outside of diagnosing certain cognitive issues.

I generally agree with your sentiments, I have met people whose IQs I don’t know but would be considered conventionally highly intelligent just from the level of knowledge they broadcast and quick wit. Many of them self-ascribed “failures”. Suffice it to say, it’s been a mission of mine to deconstruct what intelligence is. Collective smarts seem to matter much more than those of any individual.