@NoIDontWatchLoveIsland
"We have a biological drive to eat a lot too but we work hard to override it because our environment has changed and we no longer live in a calorie constrained environment."
I'm afraid you've just destroyed your own point there. In western society where food is plentiful and we are eating more calories than we burn we have an obesity epidemic on our hands with something like 60% in the UK overweight and 30% odd obese. What does this tell us? That despite all the knowledge in the world of what is healthy and no matter what we are trying to do to "override" it we are failing miserably at it. This is because again we are hard wired and driven to consume fatty and sugar dense food to help combat times of famine, that as a western nation, we just dont have anymore. Even with all the knowledge in the world we still cant seem to change things because its innate. Its built in to homosapiens to eat when there is food available. Just because our circumstances have changed our brains just dont simply "change" and catch up. Evolution in a species can take hundreds and thousands of years, and who know what kind of food will be available in another 200 years.
This is exactly why our brains with regards to infant sleep haven't changed. Because evolution takes hundreds and thousands and thousands of years to come around. Separate sleeping spaces has been around for what 200/300 years? That's not nearly enough time for anything to change evolution wise.
"Children who have been sleep trained aren't placed in their cots in a silent, withdrawn state of neglected fear and panic every night! My son at 12m would snuggle happily in his cot, cuddling his favourite toy, very clearly relaxed, smile at me as i tucked him in."
Children who have been sleep trained are conditioned, not to actually sleep, (again this is a developmental thing) but are conditioned that no one is coming no matter how much of a fuss they make. They learn that making noise doesnt result in the caregiver coming so biologically its safer to just shut up as to not alert any predators. Just because your son does this doesnt mean its representative of all children. You are using an anecdotal account to cloud judgement as statistics would say different.
As a 2 week old my mum would put me down in my cot in a separate room and I'd just sleep right through, this biologically isnt the norm for most babies.
"No one is saying teach children to sleep alone 5 miles from another human. We are saying teach them that a few metres away in the next room, easily in ear shot, is proximity enough."
Theres been research to show that children under 3 sleeping in a different room to their parents have more stress on their hearts. And again, you cant "teach" sleep. And, again (that magic word) biologically speaking a few metres away for an infant brain would be a few metres too many in a different time and place from western 2020. In a different time and place that sleep development wise we have not yet adapted from, a few metres would be the difference in life and death.
You are applying adult logic to a situation that is based on physiological drives. The two dont go together.