This is absolutely not true. Ecoli now makes up a larger percentage of infections because babies no longer die from GBS as frequently. That does not mean that the same number of babies die---they don't. It means that when they do die, it's more likely to be from something other than GBS.
If you can find a reliable source that says that there are the same number of deaths now that there were in, say, the 60s, I'd love to see it. This is literally a matter of life and death and it's important that we get it right.
So now thanks to intrapartum antibiotics ecoli and antibiotic resistant ecoli and other infections are now the leading cause of death. So although gbs deaths are down there are the same amout of deaths due to infections. Balancing vaginal flora should be the primary approach. Trouble is GBS is considered to be normal flora, by most medical folks cus 1/5-1/3 of the birthing population are colonized. Peroxide producing lactobacillus has been show to be good at colonizing the vagina and is healthier than GBS
As for oxygen the resuscitation protocols have changed for the majority of resuscitations room air is recommended for use. Part of this is that they have figured out through pulse ox that newborns transition they dont have high oxygen levels to start with. Also they dont know exactly when 90-100% oxygen becomes dammaging . So although I have carried oxygen for years I am less and less likely to turn it on.
The simplest way to make midwifery safer is to legalize it in every state and to allow those midwives to carry and use what is considered normal meds not that they should have to use them but so they could if need be.