Wow! That was a long read!
In answer to the OPs original question- I don't think it's that people who choose not to breastfeed don't understand the benefits. But understanding how a thing could be beneficial doesn't necessarily translate into wanting to do it. For example, I'm sure if I was teetotal and ate flax and vegetables all day, never let refined sugar pass my lips and performed yoga every morning at 5am after a full 10 hours sleep, it would be beneficial to my health. But somehow, it doesn't appeal....
I think the OP has had a bit of a bashing here too. She asked a question from a point of naivety, not nastiness. How can anyone who hasn't experienced the circumstances/ issues that some posters have described be expected to understand how hurtful her casual question might seem to those women?
My experience was that all through my pregnancies bf was brought up continually by MWs and HCPs with cheery bright smiles and leaflet upon leaflet. It did get on my nerves. Sometimes I wanted to talk about other aspects of my pregnancy/ birth/ looking after my baby, but it seemed like a disproportionate amount of time was spent trying to go over and over the benefits and drum in the "Breast is Best" mantra. I had already decided I wanted to bf anyway. My decision. Really didn't need all their advice/ encouragement.
Cos how hard could it be, right? My mum bf me in the 70s when few others around her did. I'm a vet, and have watched countless newborn animals latch onto mum- all so sweet! And if dogs can feed 8 at a time, surely one should be a breeze. And, as they KEPT TELLING ME, it "only hurts if you're doing it wrong". It's natural and lovely.
HAH! It bloody hurts!! Really, like actual toe-curling and trying not to scream, in my case. So I must be doing it wrong! I'll get a MW to come and help me. But they're all too busy, and I don't want to make a fuss. I must be really crap at this. I'll keep trying. But it still hurts! So obviously I'm an idiot, and I can't do the most natural thing in the world. When I finally get a MW to spare me a minute, she just confirms that I must be doing it wrong, and tells me to "take her off and try to latch her on again". It's the latching on that is excruciating, but I can't let this baby (and myself) down....repeat to fade.
Only when I got home and called a friend who bf her 2, and who breezily told me "God, yes, it hurts. Like Hell! But give it 2 weeks, it gets better. YOU'RE NOT DOING IT WRONG, did I feel any confidence to continue. (She was right, and I bf all 3 for 7 mths, 6 mths and 1 yr, respectively, and I came to love it, mainly because it meant DH had to do everything else while I sat feeding
)
BUT my point is, there was ZERO support to help me. I felt let down that no one had explained to me it may well hurt, just made me feel even more of a failure. I don't understand why they do that- why can't they be honest about it and then just help you?? That's the real reason so few people continue- because the lovely idyll you have just been sold at your course, OP, is pedalled out to all, and it's bollocks! Yes, lots of us came to enjoy bf eventually, and I am glad I did it, as I loved the feeling of my babies there, but it is NOT easy, it doesn't start off feeling "natural" and there is such anxiety involved if you feel you might "fail". Maybe if they could just be more realistic and provide support over promotion, it would be better. But even then I would defend people's right to choose what they feel suits them and their body. It's such a personal thing. I just "don't like" or even "don't want to try" some things that might be good for me!