Yeah, I think you´re right. In the end, it truely depends from one´s origin. Same here in Germany - I could´nt understand a bit, if a guy from the South (Bayern (like Munich)/ Baden-Württemberg (like Stuttgart)) would speak to me with his accent.
But thanks a lot for your detailed answer
Oh my, I´ve just recognized the lots of mistakes by reading my written post. Maybe I should take a break with learning japanese and instead refresh my english language competences LOL
Best wishes to GB