how extreme is regional dialect?

ive been learning off and on for 2 years, and now im rlly locking in– When I visited Osaka, I noticed some people were saying "ookini" instead of arigato, and I noticed a few other differences in just pronunciation of words too. Is this simply like America's version of "soda vs pop" or "y'all vs you all" or does it genuinely change a lot about the language? Idk if this is like common knowledge or not but I'd love to know.

by Expensive_Pop_3249

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