IQ tests primarily measure a narrow set of cognitive abilities and often miss other important forms of intelligence, which is highly significant for how people interpret IQ scores and use them in judging others and societies[1][2][3].
In summary, while IQ tests capture some valuable cognitive traits, they should not be conflated with overall intelligence or be sole arbiters of personal or group value[4][1][2].
There are several historical and scientific examples showing how relying solely on IQ for evaluating individuals or societies led to serious misjudgments—often overlooking other types of intelligence that later proved crucial for success or wellbeing.
These examples illustrate that intelligence is multi-faceted, and judging people or groups solely on IQ leads to error, bias, and wasted potential—outcomes that broad, inclusive approaches to ability strive to overcome[1][2][6][5][7].