Yeah, I mean, I get that. Still, one could argue, not every country had such a (at best) mixed history politics-wise and naming the different states existing at different points in time quickly tells the reader a lot of political context as well as highlights that there was a said transformation process (but not a magical one).

You often refer to Germany by the state then in place you mean

No I don’t think I do…

Here you go: https://en.wikipedia.org/wiki/Generic_you

distinguishing Nazi Germany from current Germany leans into some magical trasformation

There's an interesting debate on the amount of Nazi leaders, government officials and capitalists that were allowed to stay in their positions of power in western Germany after the Nazi were defeated. As a Spanish person, I myself sadly see the legacy of fascism in the Spanish institutions, and believe that the transition to democracy was way, way, way too lenient with fascists and fascism. That said, it's useful to refer to countries whose systems of governance have changed drastically over time, by the system of the time you're referring to, it's not exclusive to Germany.