I hear you. Block Design requires strong fine motor skills and speed so certainly the PR index is not a pure measure of fluid intelligence. I can see why GAI is sometimes used although in school and real life working memory and processing speed really matter. If you are unfortunate enough to be deficient in both, it is truly a challenge to even keep up much less appear gifted. When DS had gifted WM and average PS, he managed okay but it truly became a struggle when he deteriorated to average WM and low PS.
