yes, it promoted our own indigenous music, that was a positive but the negative was that it discouraged singers from singing for example Guthries songs.
I also knew a couple who were discouraged from singing Bessie Smith because it was not their indigenous music.
you can say what you like, but i was around and my experience of events is different from yours, Jim.
that does not mean that I do not value Ewan and Berts contributions to the uk folk revival