There is no particular reason not to send the warriors (regardless of gender) off to war and give the babies to the civilians (regardless of gender).
True, but there
can easily be reasons not to train one gender as warriors at all.
Only a tiny minority of the women at any given time are giving birth. If women were twice as strong, you would send the women to war and give all their babies to the men to look after.
I have known a couple of women that seem to give birth about once a year, for several years on end. Granted, they are outliers from the curve, but in a society where childbirth was more strongly encouraged, they could easily be the norm (for those women who were physically up to the strain, at least).
The fact is that women are
not as strong, men are much more likely to have higher upper-body strength than women, and thus wield weapons more effectively. But for the sake of argument, and because humans aren't dwarves, let's presume that females actually
are the stronger gender. That leaves you with an army of strong women, and a civilian core of weak men caring for all the babies--
which they cannot breastfeed. (Granted, there is such a thing as formula, but that's a modern development.)
But most critical is the fact that a male-army nation can recover, population-wise, after a war far more quickly than a female-army one. If your military of Amazons heads off to war and comes back having suffered 50% casualties, your entire nation's population growth is bottlenecked at only half of its former rate, and it'll be 2 or 3 generations before it can return to normal. If, however, you lose half of your
male population, your nation's birthrate is largely unaffected, because it's so cheap and easy for a male to impregnate multiple females at a time. So, even in a case where the females of a species are physically stronger, a prolonged war between two nations who use opposite genders as their warrior caste would inevitably lead to the annihilation of the female-army civilization, due to repeated attrition of their most critical reproductive members.
NOW. The
real question. Why are you all devoting so much time & attention to an issue that Toady almost certainly is dead-set
against?
[EDIT:] Dang, ninja'd.