Of course, those performing the checks are subject to errors.
But the principle itself is valid, many examples that support it.
Discussion
Men can't seem to judge intelligence accurately in women. Fascinates me.
But, I guess, female intelligence doesn't have enough value for men to evolve to rate it accurately.
Yep, woman have a much greater need to select for intelligence than men. Woman are much better talent scouts, b/c their lives depend on it (up until recently).
It matters less than other characteristics for sure.
But physiognomy isn’t about intelligence per se. It’s about the quality of one’s character. Intelligence could raise said quality but it’s not the only thing.