Still, guess what, nobody has issues understanding one of another region, or even from a Switzerland canton.
I learnt standard Italian (Tuscan) whilst I lived in Bologna, and achieved a reasonable level of fluency - though sadly quite rusty now, a decade later - but I really struggled with regional dialects, especially in Sicily and Venice. It's not just the differences in pronunciation: there are also vocabulary differences.
If it's any consolation, I understand that North Americans find Glaswegian quite challenging, especially when watching "Trainspotting" (eg. https://www.youtube.com/watch?v=vc3E7UkIzt4).