Speaking from the position of one who researched birthing suites prior to her own deliveries, I'd say the main cause for stalled delivery is stupid birthing situations, set up for the convenience of the doctor. If you make a woman lie on her back and push the child up and over the pelvic arch (which slows or blocks progress) instead of having her upright or propped up, with her legs STRETCHED OUT AND FEET IN STIRRUPS instead of pulled up around her ears, then you slow the child's movement out. The upright or curled position is much more natural and lets the child slide out with the aid of gravity and without extra bones in the way. Lying down leads to more pain, higher blood pressure with the pushing, more need for episiotomies, slower deliveries, more tearing, and much more work for the mother.

That's why both of my babies were delivered by women obstetricians. They'd been there, and done that, and knew what I was looking for in the delivery. Took three hours of hard labor on the first, 90 minutes on the second. No epidural, just natural childbirth and a pudendal block for episiotomy and stitching.

SRS