It’s been a few years since my math lectures at university and I don’t remember these two being explained so simple and straightforward (probably because I wasn’t used to the syntax in math at the time) so thanks for that! This’ll definitely stick in my brain for now

In my perspective IQ only has so many consequences, due to the limitations of the method. Nowadays we know to separate different forms of intelligence and also that transferring skills between those forms can have an impact on overall ‘performance’ . That being said, it can be a good indicator for stuff but as you point out, it’s often misused as divider instead of an accelerator.