If you look under a guitar player's calluses, you will find traces of Doc Watson's influences. And if you look under any flat rock you will find a guitar player.And I don't understand making a difference between "traditional" and "folk" in the first place...but if there were two lists, Doc would be on both, because you can't "pretty up" what he does, or smooth out the rough edges for mass consumption, because there are none. He still plays great and sings great and nobody can touch what he does.
Bill C