Even if this were true, it would not follow that there is no countervailing incentive to remove barriers to employment for disadvantaged classes of people. Is it not possible that society has an interest in broad employment, especially among people disadvantaged by such tests? Two thoughts:
1) IQ tests have a history of being used deliberately to weed out applicants of certain races. This was not an incidental effect: it was the entire purpose of the test, much like literacy tests for voting. The odds of them being used this way again, were changes made in the law, seem extremely high.
2) It is interesting that LW sees so many rational arguments for policies that would give more resources to whites or Asians, especially white or Asian males with high test scores who may not have gone to college. While these arguments are phrased as both logical and obvious, LW rarely (ever?) entertains the easily constructed, similarly phrased arguments that would push resources away from LW’s typical membership. For example: “It’s been known for generations that physical strength has a positive impact statistically on outcomes in basically every sort of violent encounter, so as a default, in a world where couples and families could be attacked, people should assume a necessity for bigger, more muscular men as romantic partners.” Or how’s this: “It’s been known for generations that religious identification with the in-group eases working relationships and obviates friction over expressions of belief, so employers should as a default prefer employees share their religions.”
I’m skeptical. Suppose it is true—it doesn’t follow that there’s a realistic possibility of broadening the appeal, much less making it the “standard” general-interest discussion hub. I think there are dozens of reasons it’s unlikely, but off the top of my head: there are many publications and forums already motivated to do so who have deeper pockets, and it is incredibly hard to corral contributors in such a way that they generate high value content for you without wanting to captain their own ships.
But that’s supposing it’s true. An outside observer might reasonably see a little bit of hubris in the claim that LW is the highest-level discussion forum on the entire internet. And I think it’s pretty obvious that it’s not general interest. It’s a very narrow set of interests: cognitive bias, AI, philosophy, cryogenics, philanthropy, evo psych, economics, lifehacking. And those interests are approached from a very unique ideological perspective—most people just aren’t into cryogenics, whether that’s rational or not. Even people very interested in one or more of these topics may not be interested in the others, and they’re very likely to be interested in other topics, which LW does not have room for. Such as celebrity gossip, or sous-vide cooking, or hip hop.