Sorry no time to read whole thread and hope not too late to post answer to original post as I have strong views on this.
"So I am wondering, given the benefits of breastfeeding, why would anyone "choose" to bottlefeed??"
Our culture/society is really not supportive and conducive to breastfeeding in a multitude of ways (eg we usu don't have large extended family of women who have a lot of experience of bfeeding on hand; we often have to look after house/other children as well; lots of negativity towards bfeeding within families/society etc etc) so I don't see it as surprising that many women would choose not to.
You could also ask the question "given the benefits of organic food why would anyone "choose" to feed their kids non-organic food?"
Or "given the benefits of two-parent families, why would anyone "choose" to live in a one-parent family?"
There are loads of factors influencing all parenting choices and just because something is "best" for the child doesn't mean it is the "best" decision in all situations/circumstances.
Also in response to kiskidee:
"yes, you do get snuggles, eye to eye etc with bottlefeeding. it just isn't the same though in a way which i can't quantify."
That may be so in your experience, in my experience I didn't begin to bond preperly with ds til we weren't bfeeding anymore and I found/find the experience of ffeeding much closer and more bonding than bfeeding.