I've always understood the increase in diagnoses to be more about increased awareness than about a change in human behavior. E.g. it looks like autism wasn't d

I've always understood the increase in diagnoses to be more about increased awareness than about a change in human behavior. E.g. it looks like autism wasn't defined as a spectrum in the DSM until either 1994 or 2000: https://www.spectrumnews.org/news/evolution-autism-diagnosis-explained/#:~:text=When%20was%20autism%20first%20presented,five%20conditions%20with%20distinct%20features https://www.spectrumnews.org/news/evolution-autism-diagnosis....