I would like to nuance this a bit. I doubt there are significant autosomal differences between rural, working class urban and middle class urban in Romania, much like you said. However, this is not scholarly proven, and research might bring surprises. Rural population was not the same everywhere in Romania: there were differences between mountain villages and low lands villages, market villages and farming villages, etc. In terms of haplogroups Romania is very diverse compared to other European countries, and yet balanced (there are 5 major haplogroups present in Romania) - this also brings phenotypical complexity.
You can see how work requirements bias a phenotypical sample even when drawn from the same population, for instance when you compare the Romanian police with the Romanian armed forces (see this thread:
https://www.theapricity.com/forum/sh...anian-military). You can immediately notice that the Romanian police is far more Med, shorter and more gracile looking than the armed forces.
You can also compare the police and army phenos with those of middle class Romanians - it is obvious that middle class Romanians have less steppe influence and the Slavic influence is more biased towards Central Euro than Eastern Euro (South Slavic influence stays the same):
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