Perhaps, but I recently read something which suggested they (to be precise, Native Americans) really were happier than the European settlers of the time:

"All of the white people who joined Indian tribes loved it and refused to go back to white civilization. All the Indians who joined white civilization hated it and did everything they could to go back to their previous tribal lives."

http://squid314.livejournal.com/340809.html (There's a lot more on the subject than just the bit I quoted.)

Yes it is, I'm glossing over what could have robbed the primordial tribesmen of the same satisfaction, such as a dominating chief, subjugation by neighbors, failure to contribute to your tribe and thus be demoted, environmental changes causing a hunter to resort to farming...

There were challenges, but generally you had the opportunity to overcome them as the default path. Today the default path does not necessarily lead to self actualization.

Many of us who post here happen to want the same thing: freelancing, side project income, small business, start up. This can't simply be a coincidence, and in my view what they have in common is the autonomy and accomplishment needs we have.