I don't think that is true of all twin pregnancies. We believe it because we are TOLD it is and because the majority of women carrying twins will end up with an early c/sec. It doesn't mean that having surgery was necessary, I think it's just becoming the norm because as soon as you confirm you have twins on board you're slapped with a big neon sign flashing "high risk"
Twins are higher risk than singleton's
and yes some women are able to deliver naturally but at the end of the day if you choose or a c section is recommended then that is the best way for your bubs to be delivered. I know it isn't relevant to this post but although yes our bodies are made to deliver babies i wonder what some women would choose when faced with the decision of natural birth v's healthy baby!!!
You say natural birth V healthy baby like you're making a choice between one or the other. They are not exclusive of each other. You can have both, healthy twins do get birthed.