And while there is certainly division of labour as you describe it, it does not necessarily imply that these are distinct social classes (even today, we have different job roles in a single social class).
Such hunter gatherer band was much worse dystopia village. You were dependent with your life on the band and if you disagreed with others, you could not just switch bands as easily as you can switch employers today.
If you said we have greater material comforts today, I couldn't disagree with you. If you said we're happier? I'm not so sure. There is something so damned compelling about a tight knit family and tribe.