Honestly it’s just so useful. It should be the default.
I picked it up when I lived in Houston, but when I was bartending and stuff after returning to my home state, I’d use it heavily.
Interestingly, though, it made people think I was from another country entirely? Because in absolutely no other way do I sound even remotely southern. (I do use various non-American slang, but not with strangers) Was always a blast to have someone ask where I was from, and try to get them to pinpoint why they didn’t think I was local, when I was born 15 minutes from where the conversation was taking place :p
It also serves to keep people isolated, and prevents kids from forming lasting relationships that can later be used to discuss and compare issues and organize.