It's very relevant for populations.  I'd be fine with people telling themselves the pat phrase that IQ doesn't matter if it weren't for government SocJus objecting that there are too many East Asians and not enough blacks in med school.  Blank-slatist policies have given us unfair discrimination in med school admissions.  They have given us schools shutting down GT programs because they aren't "diverse" enough (high-IQ nonwhites don't count, see). If bell curves didn't matter, men and women would play in the same chess league.