I'd take it a step further and say that very weak (which renders them unattractive) men aren't even good for their sperm, as they will be effectively invisible to the vast majority of women in today's "dating" climate. Remember that it takes only 1 man to knock up an entire town. But yeah I'd broadly agree that it's a critical mass of weak men that is likely responsible for the Black Widow phenomenon. Generally speaking, a man who is habitually unable or unwilling to take charge drives his woman nuts. I don't think most women want to have to compete with men in mixed-gender work environments; yes, some women can and do thrive in that sort of setting, but I'd say they're in the minority. Also, mixed-gender office environments produce the dual problem of angry harpies and emasculated male office fauna who try their level best to keep their heads down and avoid getting caught up in office drama. The only person in an office setting who gets to be truly masculine is the male boss. The most dominant man in the workplace will have much of the female staff competing for his attention, which produces the third main problem of mixed-gender offices, which is all the gossiping and backbiting that takes place and sometimes ends up ruining people's careers for the stupidest of reasons.

I also agree that nobody can be all these things at once and to have everyone running around doing each other's roles leads to the exact kind of dumpster fire we are in right now. It's one giant intractable clustercluck, and the so called gender wars are a direct result of this. I'd argue this problem actually goes back to the beginnings of the industrial revolution, but that's another topic for another time. Sadly, I think this is going to keep getting more polarized and ugly until things finally bottom out.