The crazy thing you think people are doing is not actually being done. IQ is not intended to represent 'all that intelligence is'. It is simply one way to meas

The crazy thing you think people are doing is not actually being done. IQ is not intended to represent 'all that intelligence is'. It is simply one way to measure a cross section of particular capacities that are valuable in a modern society and are easy to test. E.g It doesn't attempt to measure the ability to track an animal, or remember the face of a person you met once last year. This test is of interest because it is strongly predictive of other things we do care about, like educational attainment, criminal behavior, economic outcomes, etc.