>>509775057>>509776224First we need to define "human development".
I think a starting definition of a "highly developed country" could be having a physically and mentally healthy population, a high-trust community with self-sufficiency in food and energy production, good infrastructure including public transport, good medical services, high rates of innovations, high median wealth, low crime, low exploitation of workers, and replacement-level birth rates.
The HDI is 1/3 average life expectancy, 1/3 gross national income per capita (worse indicator of wealth than median wealth per adult), and 1/3 average years of education per person (including education of women who we all know shouldn't be educated to the same degree as men, but it gives feminist countries an advantage in the HDI)