Never liked "the South" being one region.
I'm in NC. Texas is another planet damn near from what me and my folks here is on.
But even from VA to NC to SC you're gonna have MAJOR differences.
"The South" is like half dozen or more distinct different areas.
"Northeast" is basically NYC and surrounding Metros.
"West" is basically Cali
Every region is like this fam, they can all be broken down into subregions...
The South definitely has distinctive areas, most of Virginia is an entirely different kind of South than the rest of the South; "Virginia southern" for the most part is much more blended as a hybrid of the lower Northeast and old school coastal southern characteristics...
Never been but I've been told parts of Florida is also a different kind of South, same as you described for Texas...
The greater Memphis region that extends across the Arkansas and Mississippi deltas, into Central Sip, is a culture unto itself. Tennessee (outside Memphis) and Kentucky are they own thing, West Virginia is this Ohio/VA/KY/PA hybrid state, Louisiana is its own thing, then you have the Gulf Coast South that basically unites the Houston to Tampa Bay areas of the South along the Gulf...
And while most people won't consider Maryland a southern state, one is either ignorant of traditional South identifiers or in outright denial if they doubt there are southernisms throughout Maryland--->it isn't heavily southern but there are southernisms there certainly...
Carolina and Georgia are the same place, Arkansas and Oklahoma are Texas-lite...
The point is you have subregions but all of these subregions are still a variant of the larger South, and you can do this everywhere else. The Northeast isn't just Greater New York. There's New England which can be subdivided itself, the Great Lakes Northeast that bleeds into The Mid, the Interior Northeast, etc...
The West isn't just California obviously, and the Midwest has the Upper Mid, the Great Plains, the Lower Mid, Great Lakes, etc...
But all these subregions share larger characteristics typical of the larger region...