The thought experiment isn't to think back to how you felt in the past, it's to imagine your current self in the past. The past is often fondly remembered due to youthful adventure; something which is ongoing with current youth.
No doubt there are people that have found more joy transitioning to a more primitive lifestyle, but that isn't the norm. Those aboriginals living in the jungles are coming out and adopting modern amenities. Running around naked exposed to the elements and dying at 30 doesn't appeal to them once they see there is an alternative.
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