I think there is a lot of truth in some of what they are saying.
Perpetually, people say that it's not true to suggest that breastfeeding is "more restrictive" than bottlefeeding. I'm sorry, but if you want to go out in the evening or occasionally have someone else give a night feed, bottlefeeding is a MILLION times easier than breastfeeding.
I breastfed til 2 years, but I can see with friends who ff that they DO have a lot more social freedom than I had.
As someone who had severe PND and OCD, there were times my adherence to exclusive breastfeeding was actually not that great for me or my baby. He was a very poor feeder and part of my OCD was a) that I had an obsessive need to stick with it even when he was losing weight terribly and was very ratty as a result and b) I read all sorts of things into the weight loss that were unhelpful. Also, things that normally keep me well were impossible as my baby was a 2 hourly feeder so I couldn't get out to have a massage or a swim or even a decent walk, because I had to be on call pretty much round the clock. A bit more sleep would have been very good for my recovery. Severe PND and OCD carry their own risks to development and long term health of mother and child but God knows, no one you would ever have met would have pretended this could POSSIBLY be true.
I know some of the Uber Breastfeeders will read this and tut and shake their heads sadly and say "but you felt like that because you were ill, it's not the fault of breastfeeding"... and in no way would I blame breastfeeding for my illness. However, I had very little family or community support outside of my husband and the things I needed to do were often hampered by breastfeeding. Combining the breast with the bottle would not have done all that much harm to me or my baby, but actually, while everyone scoffs at it a terribly unhappy, restless, anxious mother does breed an unhappy, restless anxious child and there is lots of research to prove it.
Sensible advice and not approaching breastfeeding as the Holy Grail of health across the board seem a good idea. Certainly, the "support" I got to continue breastfeeding felt like any mother who would consider opting out was a poor one, and no one ever suggested the costs of extreme sleep deprivation in relation to my mental health.