I am not great with feminist theory but I am a childbirth educator with feminist leanings. I can only tell you my personal thoughts on this but it might help put your feelings into context.
I teach a lot of women, normal, everyday women who want to experience childbirth. They want to know what a contraction is and to feel the labour. The mums-to-be I see with breech babies often feels devastated at the suggestion of ELCS and not giving birth vaginally. This might sound odd - it's a chance not to experience the pain and physical challenge of labour (not that CS is a breeze) but yet I don't know many women who chose not feel anything.
Yes, some choose gas & air, pethidine, epidurals etc but the idea of feeling nothing at all makes them feel cheated of a right of passage.
My own view is that childbirth has become very medicalised and medicine is male dominated, obstretrics is suspicious and distrustful of womens bodies and what they're capable of and, at the risk of sounding extreme, I believe the medicalisation of pregnancy and birth is just another way to control women.
We know that interferring with birth increases risks to mothers and their babies, research is everywhere. Medicalised birth should be available to those who need it but on the whole, most women would do better with the support of another woman and an environment that was more conducive with good birth than a bright, sterile delivery suite, (usually) a male observer and lack of privacy and control.
Incidentally I also don't believe too strongly in the theory that we have evolved to have worse births than other mammals. I think evolution compensates for that in other ways (human babies born prematurely, we can give birth on all fours changing the shape of the pelvis and our joints are designed to move to allow baby to pass through and babies head moulds to allow the same). I truly think our culture of managing birth, taking away womens control over their own births and how we're surrounded by stories of terrible births has more to do with it.
I also saw the photo gallery on Manila in the Guardian and felt sick at the way those women are treated. No privacy, dignity, birthing on their back. Its just not how women would chose to do it if left to their own devices, I don't believe anyway.