So what if for some reason there were no post-war mass deportations? No population transfer between Poland and USSR, no mass expulsion of Germans. I think it won't affect much until after the end of Cold War. I imagine that in this case the reunification of Germany would not be possible because if I remember this correctly in OTL there were fears that FRG would try to press its claims on former german eastern territories, and ITTL these territories have a large German minority so these claims might look a bit more justifiable. Also, any chances of assimilation of German population by Czechoslovakia or Poland?