even you will admit that "Forget about those lands ever being "German" is a statement is completely unsubstantiated by facts
Even me? But yes, this statement is, of course, far from truth. Those lands are, and always were, of mixed Germanic-Slavic heritage, and this is also what makes them so fascinating and interesting.
what it used to be at a certain point in time
But why choose this point in time that is most suitable for you? Why out of over 1000 years of Gdańsk/Danzig history choose only those 250 or so (only a quarter of its existence) and define it as German city?
you can't just grant minority rights to any group of migrants, that is pretty clear.
Of course not. But freedom of movement is a relatively new development, and we have third generation of those people living in Germany already! How many generations do you want to wait?
They were not intented to allow a group to relocate and assume special rights over the areas' original inhabitants-
So why did Germany so vehemently supported the independence for Albanian immigrants in Serbian Kosovo?
It would just reflect badly on Poland if it were to break its' legal obligation in the case of German minority rights.
As far as I am aware there are no such plans. Poland is a civilised country, but we would expect and hope for equal measure of civilizational standards from our neighbours.
find long arguments about Polish or Serbian or German lands to be incredibly tedious...
Me too. I mean, if we want the EU to become more like a federal state and cooperate ever more closely, then with time it will be a bit like historical territorial disputes between Idaho and Wyoming. However, we haven't achieved that level of unity yet (and maybe it's not such a bad thing after all).
It made sense since there were several times more of them than all the official minorities put together but it didn't go anywhere.
They are still relatively newcomers - with time I am quite sure that they will be recognised as minority. And I am really surprised when people give me examples of Indians or Vietnamese in relation to Polish-German relations. Liebe leute, Poland and Germany have been neigbours for centuries - borders shifted, populations mingled - there are both German and Polish minorities within Germany's and Poland's respective borders.
How on earth anyone can mention India or Vietnam in this respect is, frankly, beyond me.