You are right this site is to help others with sleep
BUT in keeping with Tracy's ethos, which was never to support methods that left babies to cry alone to promote sleep.
See this link in the FAQ
https://babywhispererforums.com/index.php?topic=19710.0Also as someone who spent more than a decade at the coal face of medical research & since children I have proofed and checked for correct cross-referencing of hundreds of research papers, I'm well aware how data can be used to support a chosen theory, while ignoring information that indicates otherwise. Scientific evidence is almost always used to support the desired outcome and is (surprisingly often) not as accurate as it should be.
Also the Nurse I spoke about has worked for almost 3 decades at an organisation in Australia, that's sole purpose is to help parents with babies... the organisation "The Royal Society for the Welfare of Mothers and Babies": is 100 years old & has multiple centres across NSW & more recently into Asian Countries. It has people employed whose sole job is determine best practice and because of their research, they will never always look to methods that will avoid any potential stress on a baby (& crying does cause stress) . As you say there is no scientific evidence that it is harmful... but yet the The Australian Association for Infant Mental Health Inc, seems to question otherwise in a broader look at wellbeing.
But as you say each their own & I've written all this for any other parents to help them understand that Controlled crying is not best practice.