Most probably those who have not visited and broken bread with relatives in Poland or live mainly in expat or yuppy-Pole circles can never gain a full grasp of what the country is all about.
I agree that those who don't learn the language and mainly hang out with other foreigners don't learn much about Poland.
But, yuppy-Poles (as you refer to them) are just as much a part of the country (just as Polish) as the old uncles piddling around with bimber. I'd be sad if Polish people stopped making bimber and nalewka but most young people would rather shop for alcohol than make it themselves and are liable to see the homemade tradition as a necessity brought about by communism and other economic hardships. It's a good thing that Polish people now have a choice between homemade nalewka and a broad variety of retail products (from mass market to boutique tastes, I recently had a taste of pigwóka (from quince) that was delicious made by one of the many firms creating quality versions of traditional Polish foods and drink.
And there are plenty of us foreigners who've broken bread with Polish families. If anything a foreigner who can speak the language well can get a broader panoramic of the country than those whose experience is limited to old world relations and still thinks of the country as one big skansen....