Being in the EU without using the Euro has been pretty good for Poland.
That's an interesting perspective. From what I see in the news, the EU isn't as happy with the outcome.
Once Poland becomes more prosperous and its growth rate slows, it would make sense for it to move to the euro. It just doesn't now.
https://en.m.wikipedia.org/wiki/List_of_sovereign_states_in_...
The inability to set monetary policy is a strong argument. Just ask Greece (and Spain):
That's one part of it. The other part is that the country had just as much human capital and economic potential as Western European states, but was held back artificially by the Partitions, WW2, the Soviet Union, and the lack of Marshall Plan investment that Western Europe received.
Sorry, but the narrative of "Poland is only doing well because the EU is helping" (of which German companies are benefitting from tremendously) is a historically narrow way to analyze the situation.
https://en.wikipedia.org/wiki/Polish_material_losses_during_...