Maybe I'll take a quick stab at that.
Both my in-laws are Polish, and it doesn't hurt, but it's not the primary driver of business.
I think maybe the first wave of migration from a country to come over will maintain strong links to the old country, as they say, but a lot of the immigration from Europe is now into its second or third generation. I think they're just looking for business opportunities, to be honest.
There will be some familiarity with the languages and customs in the various EU member states. They will be familiar with that, making it easier for them to import and to trade and so on, maybe set up business operations, but by and large, the primary driver will be the business opportunity that exists in the European Union, and it won't necessarily be cultural.