I wonder why the old advice was being given if it was so wrong? If nobody understood what to do, shouldn't there have been no advice instead of something harmful?
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For instance the "cry it out method" did massive amounts of psychological damage to more than one generation, but it seemed to work in the short term as the babies eventually learned to "self-soothe".
Even now I still see parents and grandparents suggesting it in parenting groups; and taking extreme umbrage at the idea that it might have damaged them/their children.
https://www.google.com/search?q=infant+co-regulation+vs+self...
https://en.wikipedia.org/wiki/Emotional_self-regulation