I think the less painful point of view on a G factor is that it is trainable (you can increase it over time), but the amount of effort it requires is inversely proportional to the current G factor score. Hence a lot of people stay on the similar level (as can be observed on the example of SAT scores in middle school).,(reply>), really? I feel like people with very high G factor might have a harder time increasing, where people with very low G factor might be able to make huge improvements by practicing some basic critical thinking skills. something like diminishing returns