From the south eh? Well - country music led to Southern Rock, which is in fact, the genesis of Heavy Metal. (I'm not talking death metal growlers) Zak Wilde is a classic example. Metallica - you should see James Hetman play Waylon songs!
Metal is often more difficult to play at a technical level and I wouldn't say that using bar chords on seven strings makes the sounds. Those cats know their way around the finger board. However, just knowing how to start a car doesn't make you a driver.
The problem everyone seems to be talking about here may have something to do with production - my pal listens to contemporary country in his car and I swear it all seems to sound like the same band to me. Hair metal went that way and I won't even mention pop. All growler bands sound the same to me as well.
In the sixties / seventies you knew in two measures what band it was you were hearing - Stones, Zep, Airplane and yes, George Jones, Merle Haggard, Willie and so on. Even pop was better and the Motown sound was certainly unique - unlike today's plodding Rap efforts.
I think a lot of that had to do with them using different gear and being recorded without all the fancy, soul destroying techniques in the studio. And of course, they were raw, young and hungry. They didn't go into with preconceptions based on decades of YouTube and videos and boring articles on mixing sounds. They just cut loose and the ones that could get it done, got it done.
I also think, and it pains me to state this, that originality is way down in the US. i often find myself trolling the EURO markets for something that actually sounds like something I haven't already heard nine times. Particularly with metal - there is a requirement for some thoughtfulness in the songwriting (think Iron Maiden). Folks aren't so well educated these days and confuse 'guitar hero' with making music.
Talbot