The way I understood his overall point was that in a perfect world were there is not socio-economical bias and a large enough sample size, we would still not ha

The way I understood his overall point was that in a perfect world were there is not socio-economical bias and a large enough sample size, we would still not have 50/50 split in every single field. Now, even with that being true, that doesn't mean that whatever percentage we have right now is equilibrium either, but from my understanding, he was trying to say that we should be careful pushing too much towards 50% split.