As I said in my last post, a feminist desire to "break down gender barriers" was not motivating my agreement with Mr. Seeds - it was rather a sympathetic feeling that young women could and perhaps should share the burden of obligatory military service with young men in the ways in which they are able. Mr. Seeds is hardly a die-hard feminist agitating for equity, if you'll look at his earlier posts, but he finds the fact that only men are forced to sign up for the draft "deeply upsetting". I don't want to put words in his mouth, but I would guess he finds it unfair that one gender is automatically exempt from enlistment. I don't think it would be unreasonable to require some forms of military service from young women during times of war. As for your analogy between motherhood and military service, and the exemptions made for each, the main issue is that exemption from motherhood is voluntary, and exemption from military service is not.
I think the real obstacle is not theoretical, but the practical one you brought up - the question of whether instituting exemptions for motherhood would create an incentive to have children. If drafted women were restricted to non-combat roles, I'm not as certain that we'd have a rush of 18 year old women getting pregnant, as the risk to their lives would be diminished (assuming that fear is the biggest reason people dislike drafts). But, I think you have a real point there, and I don't have any good response
It's interesting, I didn't think my support for the inclusion of women in the draft meant I regarded gender roles as "awful". I agree that there are some biological differences between the sexes, but I'm just a lot more "conservative" about how I extrapolate those differences into policy. A gender may exhibit a tendency to do better or be better at certain kinds of tasks (parenthood, mathematics, etc) but I am highly skeptical of leaping from those tendencies (generally of debatable etiology) into acceptance of the status quo. For example, even if we accept that women make better parents than men, there are still swathes of men that are better parents than swathes of women, and it doesn't seem right to dismiss a company's choice to offer paternity leave as an absurd attempt at gender equity.