But I think it hides away how much they got done within their limited means and technology. Them not knowing about bacteria was less a limitation of their intelligence than a limitation of the scale they could observe the word (including data collection technology and drawing patterns from huge samples)
Left to our own devices, none of us would ever learn anything more than a miniscule fraction of what we know today.
For example, one could wonder how much of the mess of current US politics is because the average age of people in power is so far about 60?
Yes, the elderly also worked within prior socio-political configurations but I think we can agree bagging at Walmart is pretty distinct from doing artisanal crafting or agriculture.
With what does that agree? Where is that stated?
> there are different, equally valid systems for measuring the “goodness” of an individual or a social group
It's essential to understand that people have perspectives, values, and situations outside my own or even outside my own imagination, and that their similarity to my 'system' is not a measure of their validity.
That means that making judgments is very error-prone. But that's different than saying all systems are equally valid, or are good, or that goodness is subjective. Making the judgment that system A is equally good and valid as system B by virtue of their existence is far more error prone. It's like saying, when evaluating programming languages for a project, 'I'm not absolutely certain, so I'm scoring them all 100!'.
The key phrase is "at birth". The vast majority of the difference between "75 years at birth" and "25 years at birth" is due to infant/toddler mortality.
If you made it to 10, your life expectancy wasn't a lot different than today.
The max has not really changed that much, and modern life may be killing some people, but the percentage of people who survive from 25 to 75 has also improved a lot.