Scientific method & infant studies

Further thoughts on this article which revealed, to every parent's astonishment I'm sure, that babies remember what upsets them and learn to hope for less in the future:
http://www.physorg.com/news201964561.html
My first, suppressed response was a huge internal "WTHF??? Who'd do
that deliberately??"
But I was a nurse for years -- I know what people will do deliberately and I won't go into it here, especially since I just had a tasty breakfast.
My second thought was the one reflecting my training, which tells me that if it isn't repeated in a number of controlled scientific experiments, it's not accepted medical knowledge (document, document, document!), and if it's not accepted scientifically, it won't be accepted as good parenting practice.
grrrrrrrrrrrrrrrrrrrr... But I digress.
On the one hand, I'm glad that a few OBs might suggest that parents hang onto their infants instead of handling them like awkward, smelly little responsibilities to be managed with as little face-time as possible.
On the other, I find it profoundly, horribly wrong to tell young parents to walk away from their screaming baby and stay there while we stab or slash the kid to get a few blood samples, and then come back again later to do it all again.
Because heaven knows you can't just watch the painful reality of life unfold naturally. That would require the assumption, antithetical to scientific method's assumptions, that observation and empathy in a real-world setting (where sometimes kids get put down for real reasons) is a valid basis for drawing conclusions.
I could go on about psychogenic shock, neurological development, early bonding, the isolationist shift in child-rearing advice over 30 years, the current puzzlement among psychologists about the staggering proportion of young adults who are incapable of empathy, the weirdness of the fact that most of the world is toilet-trained by ~2 but here we're rarely trained by 4... And so on.
But that could take awhile and my iPhone is starting to make my fingertips sting.