>>2632238In point 1 you claim the southern drawl is a good substitute for an osakan accent. In point 2 you claim she doesnt even have an osakan accent. So how could the dub still be accurate?
Ignoring that, the main problem is that, in the original japanese, osaka's background completely contrasts her personality. A southern drawl actually makes sense for a character who is ditsy and slow. This ruins the original joke, and just turns osaka into an uninteresting "southern girl". There's no contrast. We expect osaka's character to go with her southern accent. I hold that osaka's accent should have either been northeastern, or just normal. Anything is better than a southern accent, it completely kills the joke.