Secondly, many folk guitarists use a percussive style for some of their accompaniment, not altogether easy on an electric guitar.

Exactly, which is why I prefer the electric guitar played as pure noise in the manner I described earlier. The Folk Revival has its own Conventions, which is only natural but none of them relate to The Tradition per se. In Folk Clubs I mostly use fiddle / kemence and electro shruti box these days; if we've got an amp around I'll augment the drone with a few random modal-loops on the Kaossilator (like THIS - Childe Owlett, which I learned by osmosis from a session we did with Sally Bee).

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Purism seems to afflict those who have been drawn into the Religiosity of Folk; those who are looking for rules, relulations, meaning and belonging. Maybe they're religious too, unable to cope with the beauteous randomness and perfect common chaos of reality.