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Oh yeah, those maps are fascinating. For the record, I'm firmly in the 'Bütschgi' camp when it comes to what the apple core is called. 'Bitzgi' and 'Bitschgi' are still understandable, as is 'Bätzgi', but of course 'Gröibschi' is just ridiculous.
For sure not very foreigner-friendly! I'd recommend just learning standard German and not to worry about any of this for starters... :D
Sure, but both 'modern' Swiss Italian and Swiss French is basically just 'standard' Italian / French with a slightly different accent, and some regional jargon. Swiss German on the other hand is varied enough that some dialects sound like a different language, especially the further you go up the mountains.
Swiss Italian (and I think Swiss French too) used to be like that, but it got lost over the last ~50-80 years. My grandparents from the Ticino still speak the old local Lopagno dialect, as does everyone else from their generation, but that is the last generation that did so consistently.