That's a great explanation and Learn Bitcoin (who's also from our Bengali local board) told me the same, that Bangla language wasn't isn't really a historical native language because it originated from many sources, for example from England's rule in that part of the world and Bengali was heavily influenced from it. But you already did a great job here explaining it.
That's where German and the Bengali language are very different.

I'm judging "Denglish" or GazetaBitcoin "Romglish" (Romanian + English) from the following viewpoint:

In German, we have a lot of words, even many words for the same thing, sometimes a little bit different meaning (just nuances). So, in Germany we have these words but often, someone wants to be "cool" because he's using English words instead of German ones, while there ARE plenty of German words to express exactly, what he's wanting to say.


And if we don't apply these words, our original language might go extinct and get replaced by a horrible gibberish, where our native language gets less words every time because words are replaced by a different language all the time and it's a big pity for our native language.
As someone, who's well aware that in German, many people don't apply our native language correctly, I have "avoiding Denglish / applying our language properly" as my Merit criteria to make aware to avoid eroding our own language.
Because once a word is replaced, such words are lost in our language and it's very sad in my opinion


So, we can see, it seems to be really very different for our languages.