Huh? Famines, disease outbreaks and such were much more common at the beginning of the agricultural revolution. Hunter-gatherer bands were much safer from famine than early agricultural workers. This was true from the beginning, to the Irish famine in the UK 170 years ago. And insofar as epidemics - we are in at least one right now, if the monkey pox one doesn't get set to make two.
Insofar as general prosperity - the inflation-adjusted hourly wage in the US is below what it was a half century ago. This also pre-dates the recent inflation and Covid. I don't see how wages falling over the past 50 years is some sort of general prosperity.
In terms of general prosperity, you're comparing some metrics today to 50 years ago, and I'm not sure I understand the relevance. We were no more a H/G society 50 years ago than we are today. Do you know of any H/G societies that exist today? How does their prosperity compare to the poorest of the developed world? Do you know any developed nations that are still hunter/gather societies? Do you think this is merely coincidence or perhaps a big conspiracy?