GDP/capita is often a relatively useless metric in modern times. For instance Ireland has one of the highest GDP/capitas in the world -- around 50% higher than the US. But that's because of economic games with their working as a tax haven to enable corporations to avoid paying taxes to their home countries. It doesn't translate to anything for the average Irishman.
We visit western European countries and it's like WTF it's cheaper here?
The multi-generational spread is wild - my boss remembers being raised in 80's scarcity culture verging on 2-3rd world hunger. But our entry level employees are running around demanding everyone to be up to date with everything they see and hear in these little glowing rectangles. It's like two separate progressions have been superimposed on top of each other.
People over 60 are poor, 40..60 are a mixed bag, 20..40 are struggling to keep up.
Mind you since we'd started from Russia both of them looked pretty good in comparison, that place was dire.
Warsaw is the only place in Europe where a casual search out of curiosity brought 15-20K euro/month developer positions.
"Often" is the wrong modifier. GDP/capita aligns very closely with material standard of living for the median person. If you look at the GDP/capita growth in India and China since 1990, or South Korea, Singapore, and Taiwan, since 1950, that reflects very real increases in material standards for ordinary people.
There's two, relatively well-understood situations where GDP/capita isn't reflective:
1) Countries where the economy is dominated by resource extraction or tourism 2) Tax havens
But it's pretty easy to tell whether one of these exceptions applies. It doesn't in the case of Poland, which has a broad, diversified economy with a high level of industrial production.
GDP is an average, not a median, so it might align with the average person, not the median. The average/mean can hide many things (see Anscombe s quartet) which is one of the problems with GDP IMO.
For everyone else a roulette wheel is a better measurement.