But it is exactly the idea that "authenticity is a useful concept" that is the matter of philosophical tomes. I doubt I will do any better justice to it, in an email message, than what many have taken great trouble to do.
However, in the above usage of the term by me, it suffices to fall back the general meaning/usage of the term, to mean: that which is not shallow, and that which adheres to or is aimed at achieving the defined agenda/goal/programme. The contrast in my example being David Attenborough's style of respectful engagement with nature as opposed to the clinical analysis of theorists. However, I do not intend to go as far as "There is more things in heaven and earth...".
--ravi
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