For example people almost never mention the ethnic homogeneity (and the big problems when that does not happen, see Malmo), that free selection of jobs makes gender split even more unequal than expected or the chronic alcoholism in most of Norway. Cherry picking some parts and ignoring the big picture is a fail.
So, big problem is generational and inheritance on its own, giving ability to certain groups of people to gain wealth beyond comprehension.
People in general do not have feeling how big is the gap between 100K income and 1 billion.
Biggest question is if AI does all the work, how will population of 8 billion minus 1000 wealthiest get means to survive? Further in world of smart machines, who should be owner of that AI and the wealth creates? Lastly what will people do, and should they do anything that requires "earning" to survive?
I think a more appropriate comparison is with Canada, whose system is also flawed in my opinion (I don't like the Scandinavian model either because it doesn't work anymore nor does it scale.)
Ethnicity just happens to be a good predictor for culture, and culture happens to be a good predictor for the ability to be a net-contributor in a modern society. Ethnic homogeneity predicts cultural homogeneity.