> No there's a lot of articles on IQ and intelligence. Less on hard work

There really isn't, simple search shows:

https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...

Compare to for example search for intelligence, mostly results about AI or they are about downplaying intelligence, not saying it is important:

https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...

or intelligent, same thing here:

https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...

Results that talks about the importance of intelligence get way less votes and are way less popular. Hard work tend to get hundreds of upvotes and are among the most popular on this site, articles about important of intelligence barely get any so are hard to even find via search.