The GP comment isn't really about intelligence - it is about the measurement of intelligence & the impact of parental expectations (societal, self and partner ones too).
And very unfortunately it cuts both ways.
People who measure poorly at 7 years old might be kept out of challenging classrooms where they would actually discover their talents & flourish.
People who measure high are pushed until they burn out of their skulls trying to fulfill their "measured" potential - or alternatively placed in the company of the talented where they end up with an underachiever's ego[1].
As my sister once told me "Society doesn't want you in particular, anyone who will do what you could do will do". I often think about that at work - society can afford to burn thousands of bright minds on optimizing ads and their placement.
[1] - I remember chills watching the setup for Molly's Game.
It is true though, that other factors can sometimes be much more valuable. Charisma, conscientiousness and attractiveness can carry people very far.