2. Are you perfect in your native language? You should know: Nobody is perfect! In all language areas you can register different personal vocabularies and expression schemes often regionally or professionally influenced. Between German speaking areas of Germany (and its different regions), Austria and Switzerland there sometimes are substantial differences. And even remembering my former teachers, lecturers and collegues at university all academics - and my friends with different professions, they didn´t speak and write respectively don´t same way, but they all have been or are native speakers, more or less perfect. Well educated people mostly have large vocabularies often using synonyms. Other people often don´t know certain synonyms and may think: Is that good German? It´s not easy to evaluate if language proficency is perfect or not, specially not for a not native speaker.
I am. I can definitely say that I master my native Russian perfectly. I am tolerant to those who speak Russian imperfectly if is not done on purpose. To use local dialects sure. that will go, but it is always quite obvious when a person use speech patterns and sentence constructions that are like a calque from another language! It gives you away!
But mikal, do you perfectly speak and write German being able to evaluate if a German text is this one of a native German or not? Till now I miss a final statement of Sqeeze whom I´ve transmitted some posts in German. He - allegedly - has a friend at Ingolstadt, "a real lecturer", who - allegedly - is able to assess them.
What's wrong with my friend from Ingolschtadt?
He's confirmed you're a native German or at least someone who's lived in Germany for a long time, 5+ years.
But you're definitely not a 77 years old "former lecturer" and not "an independent researcher" because you're too passionate and excited with dragging Worldcore into the dirt and very often your post are read like a sort of supportive add-ons to what Marina Uni posted.
You're just an unfair person with your own private interest in this topic - that is what my opinion.