OK. I've just read about that (life expectancy vs. span) and I now see your point, which however doesn't change the big picture. Low average means that if you pick one existence at random among the actual ones that there were, you are likely to be cut off before you taste, say, the joy of sex. In other words, not everyone can be Plinius' aunt.
I agree that a hunter-gatherer life, if purged of the inevitable brutality, is more fun in mostly any way. No boss but the priest. Easier women. Not much to fear from your peers (except for the other gang, well they too will eat you for obvious reasons, but that's just normal).
Thanks for giving it a look eddie. One of the things I value about this place is folks actually considering other ideas. Most of the internet is entrenched Ideologues talking past each other. Of course we have plenty of that here also, but a good core of people having actual conversation.