Well that Southern Appalachia video was fun. (While eating my second breakfast of Greek yogurt and a Honeycrisp apple

!)
Yes, it is important to record that history and language. The dialect is the only one in the US that is losing speakers, I've read. Integration into the larger community of American dialects is one reason.
My father's mother grew up in Texas but her parents were from Kentucky. Dad said that she made biscuits every morning and cornbread every night, in a wood stove.
Dad's father had a fair amount of Native American heritage. They were Cherokee from Eastern Tennessee and as near as I can figure out, were there before the people that were in that video .... Ha! You think that I had to figure hard to come up with that?! Well no, but what I mean is that the immediate ancestors had left that place by 1820. That was about 15 years before the Trail of Tears.
Some of the family went to what became Oklahoma, so they were there before it was "Indian Territory." Immediate ancestors seem to have gone to eastern Pennsylvania. The Quakers there had a history of protecting the Aboriginal people from expansionist violence. Those ancestors began a somewhat slower migration to Indian territory that took a few generations. My grandfather was born in western Arkansas and some of his family were in southern Illinois. It was all somewhat of a very
messy time for them and the people there right through the 1800's.
Dad and his father kept the migration going from Oklahoma and New Mexico. If Mom had been more receptive to living in the North, Dad would have taken the route right into western Canada. And, I can still remember him talking about Australia in the 1960's

.
Steve