It's fashion, it's the folk police/nazis. The '70s etc; were open minded, open policy. From Blues to Bluegrass and all the stops between.
Then the 'folkies' stipulated that it wasn't 'folk' unless it came from your roots! How far do yours spread? 10, 20, 30 miles.
Let's keep it really parochial and myopic, say, 7.5 mlies and disappear up our own district.