It's hard for me to get past my gag reflex over the noble savage stuff, to be honest. I find it to be pretty racist in many ways, even though the author is overbending backwards to express admiration for these cheerful, happy angels with no troubles because they live a blissfully simple existance.
Aside from that, I agree with the concept that kids can be very content (and some may be MORE content) living in an atmosphere where they are part of things, not the total center of existance.
OTOH, we live in a different culture and a different era. Children are not needed in the same way that they might be in a society where every single person must contribute for community survival. Since parents are not encouraged (and may even be socially/legally penalized) to view their kids as people on whom one can rely on to contribute to family/community survival, I think it's natural that then people spend more time cuddling/petting/playing/devoting themselves to their kids--after all, they probably have more time to do so as well.