There is huge selection pressure now in that many people don't even have kids. Any gene (or other inheritable trait like culture) which increases the probability of having kids will be strongly selected for.

In rich countries the selection pressure is greater than at anytime in human history. In the past no factor (other than luck) could strongly influence the number of children you had survive to adulthood as much as birth control does.

> There's less selection pressure now because there's less mortality.

There are two pathways to selection. You're only focusing on one. Sexual selection is alive and well.

Have you ever seen the film "Idiocracy"?

Are you familiar with the Flynn Effect?

Which seems to have stopped over the last 20 years or so.

…and which only ever applied to the low g fraction anyway.

We've already asked you to please follow the guidelines or don't post. Could you please read them and then start commenting civilly and substantively?

https://news.ycombinator.com/newsguidelines.html

There are still relatively strong effects. Whatever genes are statistically linked to things like less education, for example, are flooding the gene pool relative to others. There are plenty of dimensions like this.