The counter-point being that you'll have people getting vanity tests, and harping on about their smart genes, even though none of them are the sort of gene that

The counter-point being that you'll have people getting vanity tests, and harping on about their smart genes, even though none of them are the sort of gene that confers actual palpable intelligence. Some of these are not smart genes, if they still result in dimwitted people you'd hate to be trapped in a room with. They may be good genes that promote healthy survival, and statistically stongly correlated with smart people, but if they aren't the crucial genes that result in the sort of person that quickly grasps complex concepts, has nice handwriting and can keep up with high learning curves, then they are helpful health and survival genes, not intelligence genes.