Of course it's possible to survive without it all :) But you're talking about necessity versus choice.
The original posts asked if civilisation was worth the complexity that goes with it.
People who have no choice but to survive at the lowest level of complexity have no say in the matter. Ironically, those of us at the other end have the opportunity to help them, but we usually don't.
And life is an ongoing construction, so it doesn't really matter what we didn't have as kids. What matters is what we do have right now - since that's what we'd have to give up.
The thing is: living in the wilderness in 2007 in a western state is not the same as living in the wilderness in an undeveloped country.
Necessity versus choice, again.