No language is useless, please don’t say that, some are just smaller

Yes, sorry, I didn’t check other languages, as in the list there most likely are languages that are still heavily used and/or official country languages.

Initially I was under the impression that they didn’t get added before because all of them are not official ones and/or used anymore like in the case of “Silesian” that I did check and confirmed that should be avoided as much as possible. It’s a disservice to new generation of people that still (partial) learn it in their own while growing in that region. Then those people go to different region inside their own country and (because they or the region “use that variant”) then have troubles with communicating.

You have clear example with Poland and Germany. Example, imagine you live in France, you want to go to Poland (or Germany), you go to school (or get some lessons) to Learn Polish (or Germany), you drive to some random region of Poland (and Germany) and … surprise, only in that “small” region they talk not with Polish (or Germany) but their own (one of dozens) variant that they call “Silesian” (or Bavarian). And even if you go and learn “Silesian” (or Bavarian) it most likely will only help maybe partially…