Low-tech does not necessarily mean disgusting and sordid. Mohenjo-daro had indoor plumbing.

I totally agree. Nor does low-tech correlate with forthrightness or "passionate natures" or whatever. I notice an unconscious assumption that more material technology means more frilliness and decorousness and so on, and that less material technology is associated with declarative statements of the "Me Tarzan, You Jane" variety and powerful, raw emotion. But hunter-gatherer societies can have extremely complicated kinship networks and very careful etiquette for who you address how, and so on. Just because you're not wearing a powdered wig doesn't mean that you don't care about social niceties.