That’s the thing, Poland got wealthier because it became an extension of German industry, with some IT stuff thrown in. Czechia would have also been in the world’s top 20 had they had a larger population, as they’re even more dependent on said German industry.
Well, yeah. I get that being the stupid backwater of a huge capitalist union is still better than communism. However, it's not working out so well for (now mostly ex-)factory workers in Germany.
Entire cities are emptying because of this. Leaving the old behind, of course.