I know what you’re trying to imply here & Poland avoids the influx of some nationalities by using there full quota of non EU on Ukrainians & Belorussians. However my team whilst consisting of the previously aforementioned nationalities consists of Germans, Spaniards, Dutch, Romanians, Danes, Brazilians, Irish, Nigerian, Japanese, Mexican, Indian Lithuanian, Latvian and others I can’t recall. The area I live in is predominantly Indian & my local Curry House is better than anything I’ve had in the UK.
So Poland is by no means a closed country & the nationality & ethnic mix makes a great team.