Well, he didn't collect in Scotland either. Perhaps he knew that it'd be better left to people with a better understanding of the culture of Wales and Scotland to do that work? Or maybe he was just an English nationalist. That would explain why he attempted to present the song culture of (white) Appalachia as essentially English in origin, overlooking considerable Scottish and Ulster Scots influence. That would explain why the excellent ENGLISH Folk Dance and Song Society is housed at the great Cecil Sharp House!