I’m interested in the history of the language and how English has developed in different places, so I am glad for the diversity and variations and that traces of the older language remain. I was visiting Carl Sandburg’s Home in NC some years ago and heard some other visitors speaking what I believe was a mountain dialect. I didn’t understand much, but it was fascinating to hear.
You should find some of that language history in David Hackett Fischer’s “Albion’s Seed: Four British Folkways in America”
It intrigued me to see that the figures of speech that I grew up with trace back to the Cavalier and the Scots-Irish roots in my family tree. It evolved into one type of American Southern dialect.