How about pointless?

From the pop market perspective, there is no folk and no point to draw a line to or from. When big name folkie Harry Belafonte won a statuette it was the same pop category as Elvis, Pat Boone and Jim Nabors.

From the perspective of physical media, “Folk” is a bin filed by artist not content. Pete Seeger could sing the Yellow Pages and it would still be under "Folk." And Belafonte will now be found down the aisle under "Male Vocalist." If not there, try "Oldies."