why does the article never consider IQ to be a factor in success? in almost every success story that i come across, the story is about someone who is obviously

why does the article never consider IQ to be a factor in success? in almost every success story that i come across, the story is about someone who is obviously very smart. and rags to riches stories, stories where a successful person bootstraps him or herself out of an impoverished family, almost always begin with accounts of their gifted childhood. also, is it not obvious that social mobility is fucked? without unskilled labor, you need capital to get a nice job or start a business.