As a Midwife, I'm saying that many mothers don't view the child's other biological parent as "someone else" for one. They realise that both that parent and the child have as much right to an uncomplicated relationship with each other as the mother does with the child.
Secondly, nobody mentioned exclusive pumping, what I did mention is expressing milk for when you're away from the baby. Something that many mothers achieve with ease. I also mentioned that it is advisable to ensure the baby is breastfeeding efficiently before you introduce bottles. Many, many babies are mix fed from the start though and don't have the latch problems that research says they will.