You're asserting that despite women's knowledge of signaling, they're not using it as well as men within friendships (in this respect). We observe that men share less with friends, tell researchers they want more intimacy with male friends (though I can't find a quick source for gender difference there), commit suicide more often, and die more often from "boneheaded" or ambiguous actions. (On the plus side, silence makes us less susceptible to psychosomatic contagion.)