But to get back to the thread topic - logically the use of the term "Roots" for "Folk" should give rise to a distinction between "Roots Music", which would be the traditional stuff, and "Rooted Music" which would be the music derived from it. That kind of distinction has been blurred in the use of Folk to describe both leading to a situation in which is often taken to actually exclude traditional music.
One example of where this happened has been in church services, where the hymns and the music that had become traditional were discarded in favour of new and unfamiliar songs. But instead of this being decried as modernisation, the new music and songs were described as "folk", presumably on the ground that guitars were used.