As it has governed a long time and is still part of the EU
Yes, it is still a benefit to poland, and like britain did previously we play a role in impeding it's march towards becoming a united states of europe/suprastate.
Ever seen a Polish or Czech company get a major public contract in Germany?
Since you mentioned Siemens and Alston , PESA sold 72 trains to Germany, but that contract went south as they were originally going to buy 400. The Poles were not thorough enough and made bad decisions. Newag also sold trains to Italy. Škoda has been selling trains and trams to Germany in large amounts for many years.
Same with PiS socialists and EU socialists.
Stop your deluded Konfa delusions, on par with the nanobots in the vaccines..