A few of the people I met at the tech events I visited have lived in Germany long enough to get citizenship, but haven't applied because they aren't sure they could pass the language exams, and would have to take a lot of effort to get enough practice speaking - they work in English all day, and speak English to all of their friends.
Berlin is a different world from even the larger cities in southern Germany, like Munich or Nuremberg - reachable by high speed train in 3-5 hours.
For Americans, think NYC (Berlin) vs. Dallas (Munich).
If you already are a EU citizen, you simply won't bother with German citizenship. It will become an interesting problem for democracy to solve with Luxemburg have some 47% foreigners, not sure how many are EU-citizens [1].
Dallas = Munich, sad but true.
[1] https://luxembourg.public.lu/de/gesellschaft-und-kultur/bevo...
[0] https://www.nytimes.com/2023/02/14/travel/museums-stolen-art... [1] https://www.iheartberlin.de/2016/01/26/famous-exiles-of-berl...