Do note that HDI does indeed depend on some assumptions and those includes "equating earning more money with a "better life"" as GNI (PPP) per capita. With no further increases after 75k USD (International dollar), unadjusted for inflation since introduction more than a decade ago. It also does give large amount of value to traditional education (i.e. total amount of years in full time schooling) and not outcomes of that (e.g. literacy). Schooling is also capped at 18 years, which is in line with a Master in most western countries; if schooling is this important then why cap it?

I'm not sure about Bhutan, because I've never been there, but for sure I think that middle-class life here in Romania (for those that can afford it) is a lot better and more relaxed than middle-class life in Norway (for starters, people here in Romania don't have to fear the State taking away their kid at a moment's notice, as it happens in Norway). Which is to say that those "charts" are very deceptive.