I don't think that Poland isn't that close to Western Europe in the aspects of technology, but maybe Paradox has similar opinion with you.It is. But Poland is really close to the west, it starts as direct neighbour to the HRE while the others don't (except Hungary). They were not that far behind in knowledge. And like i said before, they started almost western before 1.12. Poland is a special case, i think that's why Danzig is included