But mean income per capita is what should be compared when talking about social services such as healthcare, etc. If you take a developed country, add a bunch of wealth inequality to it, and then say that you can't compare that country to other developed countries because wealth inequality is part of equalition of being developed, you are just going around in circles.

Any comparison should take other effects of work culture into account as well, such as how much time per week we can devote to living once you subtract work and commute times.