Nikola,
Thank you so much for your well-stated reply. And please, do not let me inhibit you or anyone from asking any language question you like. I`m no expert in languages, that´s for sure. My opinion, as they say in German, „ist für die Katz“, you know it`s for the cat, the birds!
I do love you box analogy. It is spot on. And you are 100% correct. It takes years and a lot of work to understand the fine nuances of words and phrases when you`re learning a foreign language and I appreciate that, and even native speakers can disagree on things a little.
I think a better teaching style, is to rank order things a bit? You know what I mean? It´s like saying „this is standard style, so it´s fit for book publication or an article in a good newspaper, but this other way of speaking is non-standard, regional, not something you publish in writing. Native speakers say it, so you can`t call it wrong. So we don`t publish it.“ That´s gives you a broader understanding of the nuances of a language. German has the authority Duden, and Duden will classify words and phrases as „technical, elevated, colloquial, saloop, regional´-sometimes specifying the region, youth-language, archaic, dated, etc) so you kind of can classify the word? We have no such authority in English so you have no such guide. I think good English teachers tell you that.
But that´s hard to do with all the variations-BrEnglish, USEnglish, Australian English, and so on.
Actually, I didn`t get kicked off the other forums. Quora just suspended me for two weeks and now I`m back on but don`t use the site much. Italki just banned me a few times and then auto-reinstated me without me asking. That was a mystery. And that was a year ago. I was never banned from the german.stackexchange.com, and only temporarily on the english.stackexchange.com one because of a Frenchmen who went after me, I didn`t go after him. He was saying it was normal and well-understood when someone asked about that ridiculous sentence about „repaying the depths of their heightened enlightenment“ or some other dribble no one would ever say. Then he criticized me for saying I didn`t know what I was talking about?
But please, again, don`t let anything I say hold you back. You all are great people and the last thing I`d ever want to do is offend you.