@tante as someone whose third language is German (English second) I can kinda relate to this, especially the concepts part, which seems to only get messier as I spend more time working in German. I still have things that are exclusive to each language (though my Dutch is now so bad that I think people assume I'm a German immigrant when I visit my parents).
Science is an English thing. Politics are a German thing. Cooking is a mix of all of them (none of them particularly coherent).

@emilymbender @tante
FYI, there was also a follow-up that I found equally worth reading:
https://tante.cc/2026/02/20/on-alliances/