As as for the big babies and shoulder dystocia, all you're doing is trying to sidetrack the issue again. In your post, you decried having a C-section done because of the 'excuse' of a big baby. Big babies can be a real problem, and if there are decels or failure to progress, you need to take the baby by C-Section. There is also a formula for evaluating the size of the birth canal vs. the size of the baby to determine whether an elective C-section is advised. That evaluation is quite accurate, and given the low risks of a C-Section as weighed against the danger to mother and baby, most moms choose to go with a C-Section. And yes, it is a choice!
And as for risks before 39 weeks, there are risks involved in childbirth to both mom and baby no matter how many weeks along they are! But, I've been in on the deliveries of many babies in the 36-38 week area and from my experience, it's rare to have a problem. Usually, the problems that occur in that period of time would have occurred anyway. We just had a baby born with a neoblastoma at 37 weeks---delaying for two or three more weeks wouldn't have changed the outcome.